Spec-Driven C++: Entry

Synopsis:

This page covers Cpp_TextFinder_Entry, the binary. It wires the three libraries together and does no matching and no file I/O of its own.

It owns three things outright - the skip list, the lifetime of all three objects, and the exit code.
It writes process-level text but composes almost none of it. Each string comes from Cmdline; the binary decides only when to write it and to which stream.
86 lines of code against an 87-line specification. Everything harder than wiring lives in a library.

Ten startup steps, and the order is the specification rather than a consequence of it.

Step 2 constructs the sink before anything reaches stdout, so every write carries LF - an ordering that was a defect once.
Step 4 reads argc and no element of argv, because "no switch at all" is exactly "no tokens after the executable name".
Step 7 refuses a bad pattern in four sub-steps, one of which is a flush.
Step 9 asks for the run summary. The counts are Dirnav's; the one fact the library cannot have is that step 8 is finished.

Two rules come out of the sink deferring its flush to destruction.

Every exit is a return, never std::exit, which would discard what steps 3, 4, and 7 wrote.
Nothing writes to stderr before stdout has been flushed.

1. What the Binary Owns

Cpp_TextFinder_Entry is the command-line entry point. It parses invocation arguments through Cpp_TextFinder_Cmdline, wires the three libraries together, and drives traversal. Matching and file I/O belong to Cpp_TextFinder_Dirnav and Cpp_TextFinder_Output; the binary performs neither.

The binary does write process-level text of its own - help, the resolved option listing, and startup diagnostics - but it composes none of it. Each is a string Cpp_TextFinder_Cmdline hands it, and the binary decides only when to write it and to which stream. Block lines and announcements it neither composes nor writes.

Three things it owns outright:

The skip list, and addSkipDirectory as the build-time extension point Spec_TextFinder.md §3.5 defines. Section 3 covers it.
The lifetime of all three objects. Cpp_TextFinder_Dirnav holds references rather than copies, so the Cpp_TextFinder_Output instance, the finalized skip list, and the parsed commands must outlive it. All three are owned here.
The exit code. Section 4 covers the three values and how they map onto this binary's failure modes.

It is 86 lines, and the specification that fixes it is 87. That ratio is the point of the component: the design goal is to make the wiring itself readable, and everything harder than wiring lives in a library.

2. The Startup Sequence

main(int argc, char* argv[]) performs ten steps in order. The order is the specification rather than a consequence of it: three of the ten are placed where they are for reasons that would not survive rearranging.

Step	What happens
1	Invoke `parse(argc, argv)`. On failure, write the returned usage diagnostic to stderr unaltered and return 1. A malformed `/r` is not detected here; step 7 reaches it
2	Construct `Cpp_TextFinder_Output`. If the constructor throws, write `cannot initialize output` to stderr and return 2
3	If `/H true`, write `helpText()` to stdout and return 0
4	If `argc` is 1, write `optionsText(commands)` to stdout and return 0. This is the bare command line of §3.1
5	If `/v true`, write `optionsText(commands)` to stdout before traversal begins
6	Finalize the skip list: the defaults, then the `addSkipDirectory` calls compiled into the binary
7	Construct `Cpp_TextFinder_Dirnav<Cpp_TextFinder_Output>`. Regex compilation happens here, and the constructor throws when `/r` will not compile
8	For each root path, in the order `/P` gave them, invoke `search` on the same instance
9	Call `emitRunSummary()` on that same instance, once, after the last root path returns
10	Return 0

Step 9 is the whole of this binary's part in the run summary. Spec_TextFinder.md §3.6 puts the two counts in Cpp_TextFinder_Dirnav, so the binary supplies no count and composes no text. What it supplies is the one fact the library cannot have: that step 8 is finished.

Every exit above reaches its return before step 8, which is what makes the summary a mark of a run that traversed. /H, the bare command line, a parse failure, and a malformed /r each leave at their own step and none reaches step 9 - so none writes a summary, which is exactly what §3.6 asks. The integration suite asserts the absence for /H and for the bare command line, and asserts that a traversing run's last line is the summary.

Step 2 precedes every write to stdout. Constructing Cpp_TextFinder_Output puts the stream into the mode Spec_TextFinder.md §3.4 requires - an LF written verbatim, never translated to CRLF - so every subsequent write carries that terminator, the binary's own writes included. Help text in particular is written after this step and not before, or the fixed text of §5.1 would carry CRLF on Windows while the rest of the program's stdout carried LF. That ordering was a defect once: an earlier specification wrote the /v listing before constructing the sink, and the cross-document review caught it.

Step 4 reads argc and nothing else. It inspects no element of argv, because "no switch at all" is exactly "no tokens after the executable name". commands here is a default-constructed ProgramCommands, so the listing names every default and its /v line reads false. Steps 4 and 5 are mutually exclusive: a command line bearing /v is not bare.

Step 7 is where a bad pattern is refused, and it takes four sub-steps to report:

If step 5 did not already write it, write optionsText(commands) to stdout now, so the user sees the /r line carrying the expression that failed.
Flush stdout, so the listing reaches the stream ahead of the diagnostic that explains it. std::cerr is unit-buffered and Cpp_TextFinder_Output buffers stdout without per-line flushing, so without this the two arrive out of order.
Compose the diagnostic - invalid regex for switch: /r, a newline, then usageLine() - and write it to stderr. The binary composes it; neither library does, the one supplying only usageLine() and the other only the failure that triggers it.
Return 1, having traversed nothing.

Step 8 passes a root-path failure to nobody. A root that cannot be searched - unopenable, a symbolic link, or neither a regular file nor a directory - is announced by Cpp_TextFinder_Dirnav itself, and the binary neither formats nor inspects that notice. No root-path outcome affects the exit code.

3. The Skip List and addSkipDirectory

The binary owns the process-wide skip list, initialized with the 11 defaults of Spec_TextFinder.md §3.2, and implements the extension point as

void addSkipDirectory(const std::string& name);

It is defined in the binary's own translation unit and exported from nothing, so no library and no test can call it; the calls that extend the list are written into the binary's source and compiled with it. Duplicate entries are ignored, and [[maybe_unused]] marks the function so a build that adds no directory compiles without a warning.

That is the narrow reading of §3.5, which requires each language's specification to say whether the function is exported from a library or confined to the component that owns the list, and does not require it to be callable from outside the program. Narrow is the right reading here, because a callable addSkipDirectory would be an interface with no caller and one more thing a test could hold wrong.

The calls run at step 6, before the list is handed to Cpp_TextFinder_Dirnav, which consults but never modifies it. Nothing extends the list once traversal has begun, and the binary reads no configuration file.

4. Exit Codes

The three codes Spec_TextFinder.md §3.4 fixes map onto three failure modes. No other value is returned from main.

Code	Cause in this binary	What reaches which stream
0	Startup and traversal completed; or `/H`; or the bare command line	Search output, help, or the option listing on stdout. Match count and unopenable roots do not change it
1	Parse failure, or a malformed `/r`	A usage diagnostic on stderr. Parse failure leaves stdout empty; a malformed `/r` puts the option listing there first
2	`Cpp_TextFinder_Output` construction failed	`cannot initialize output` on stderr, no usage line, stdout empty

Only one exit-code-1 path writes to stdout, and the asymmetry is deliberate: §5.2 requires the listing ahead of the invalid-regex diagnostic so the /r line shows what failed, and leaves stdout empty for every other violation.

Every one of those strings is fixed in the C++ specifications rather than the project specification. §2 leaves the wording of anything reaching stderr to each language, so cannot initialize output and the seven usage reason lines alike bind C++ alone, while the shape of a usage diagnostic, the destination, the exit codes, and what each failure leaves on stdout bind everyone. Spec_Cpp_TextFinder_Cmdline.md §6 carries the six reason lines parse produces and Spec_Cpp_TextFinder_Entry.md §6 carries the seventh, invalid regex for switch: /r, since the binary is what writes it.

C++ adopts the wording §5.2 supplies without changing a character, so nothing the program emits moved. What moved is where a test looks to check it: at these two documents rather than at the parent, and not at another implementation, which is free to word it differently. The 49 integration assertions were already comparing against those exact strings and needed no change.

A malformed regex taking code 1 is a decision rather than a deduction. The review asked which code a regex compilation failure should take, and the answer classified it as an invalid command argument - the expression is something the user typed, so the failure is a usage failure even though it surfaces inside a library constructor.

5. Why Every Exit Is a Return

Every exit in the sequence is a return from main, never a call to std::exit. The Cpp_TextFinder_Output instance is a local of main, and only a return destroys it and flushes its stdout buffer. Steps 3, 4, and 7 each write to stdout and then leave, and std::exit would discard what they wrote.

One rule pairs with it: nothing writes to stderr before stdout has been flushed. Step 1 predates the Cpp_TextFinder_Output instance and so has no buffer to flush; step 2 fails before one exists; step 7 flushes explicitly. The Output library applies the same rule to its own output failed notice.

Both rules exist because the sink defers flushing to destruction, which the Output page covers. Deferred flushing plus a unit-buffered std::cerr is a reordering hazard, and two rules stated in the specifications are what keeps it from being one in practice. The code uses std::optional for both objects, which is what lets construction be attempted inside a try while the object's lifetime still belongs to main's scope.

6. Stated Limits

Two non-goals, and one of them is a portability limit rather than a design choice.

No per-file state in the binary. A single Cpp_TextFinder_Dirnav instance is reused across every root path, and it carries no state from one search call to the next.
No non-ASCII characters in argv. The binary takes main's char* argv[], and on Windows that system-codepage vector is not decoded to Unicode. Spec_TextFinder.md §4 leaves the argument type and its encoding to this document, so this is a stated limit of the C++ implementation rather than a departure from the parent specification. It does mean a root path or expression holding non-ASCII characters may reach this implementation differently than it reaches the Rust, C#, and Python ones, and §6's consistency guarantee speaks only to the command lines all four accept.

7. Source

main.cpp in full, then the build definition. The step numbers in the comments are the ten steps of Section 2, and the citations name the specification section each step satisfies.

main.cpp

// main.cpp - Cpp_TextFinder entry point, per Spec_Cpp_TextFinder_Entry.md

import std;
import Cpp_TextFinder_Cmdline;
import Cpp_TextFinder_Dirnav;
import Cpp_TextFinder_Output;

namespace {

// §5: the defaults of Spec_TextFinder.md §3.2, owned by the binary.
SkipList skipList{"archive", ".git", ".svn", ".hg",          "build", "out",
                  "target",  "bin",  "obj",  "__pycache__",  "node_modules"};

// §5: the build-time extension point of Spec_TextFinder.md §3.5. Defined here and exported
// from nothing, so no library and no test can call it; calls are compiled in alongside it.
[[maybe_unused]] void addSkipDirectory(const std::string& name) {
    if (std::ranges::find(skipList, name) == skipList.end()) skipList.push_back(name);
}

} // namespace

// §4: the startup sequence, in order. Every exit below is a return from main, never
// std::exit, so the Cpp_TextFinder_Output destructor flushes stdout on every path out.
int main(int argc, char* argv[]) {
    // Step 1. Nothing has reached stdout yet, so this diagnostic needs no flush before it.
    const auto parsed = parse(argc, argv);
    if (!parsed) {
        std::cerr << parsed.error();
        return 1;
    }
    const ProgramCommands& commands = *parsed;

    // Step 2. Before anything reaches stdout: constructing it puts the stream into the
    // mode Spec_TextFinder.md §3.4 requires, and the help text below depends on that too.
    std::optional<Cpp_TextFinder_Output> out;
    try {
        out.emplace();
    }
    catch (const std::exception&) {
        std::cerr << "cannot initialize output\n";
        return 2;
    }

    // Step 3.
    if (commands.help) {
        std::cout << helpText();
        return 0;
    }

    // Step 4. Spec_TextFinder.md §3.1: a command line bearing no switch at all names no
    // work. argc is read for this and nothing else; no element of argv is inspected.
    if (argc == 1) {
        std::cout << optionsText(commands);
        return 0;
    }

    // Step 5. Mutually exclusive with step 4: a command line bearing /v is not bare.
    if (commands.verbose) std::cout << optionsText(commands);

    // Step 6.
    const SkipList& skips = skipList;

    // Step 7. Regex compilation happens in the constructor.
    std::optional<Cpp_TextFinder_Dirnav<Cpp_TextFinder_Output>> dirnav;
    try {
        dirnav.emplace(*out, skips, commands);
    }
    catch (const std::regex_error&) {
        // Spec_TextFinder.md §5.2: the listing goes to stdout whatever /v says, so the /r
        // line shows the expression that failed, and is not repeated when /v produced it.
        if (!commands.verbose) std::cout << optionsText(commands);
        std::cout.flush();   // ahead of stderr, which is unit-buffered where stdout is not
        std::cerr << "invalid regex for switch: /r\n" << usageLine();
        return 1;
    }

    // Step 8. One reused instance, one root path at a time, in the order /P gave them.
    // Every root-path failure is announced by Cpp_TextFinder_Dirnav and affects nothing here.
    for (const std::string& root : commands.rootPaths) dirnav->search(std::filesystem::path{root});

    // Step 9. Only main knows the last root path has returned.
    dirnav->emitRunSummary();

    // Step 10.
    return 0;
}

Cpp_Spec_driven_TextFinder_Entry/CMakeLists.txt

add_executable(Cpp_TextFinder src/main.cpp)

target_link_libraries(Cpp_TextFinder
  PRIVATE
    Cpp_TextFinder_Cmdline
    Cpp_TextFinder_Dirnav
    Cpp_TextFinder_Output
)

target_compile_features(Cpp_TextFinder PRIVATE cxx_std_23)

8. Prompt Records

The two conversations that produced Spec_Cpp_TextFinder_Entry.md. The first covers the component directories, the nine-section draft, and the two turns that routed cannot open through the output component; the second covers the 13-item review, the 13 decisions that reordered the startup sequence, and a compression pass.

Prompts_Spec_Cpp_TextFinder_Entry.md

# Prompts and Replies — Spec_Cpp_TextFinder_Entry Development

This file records the prompts and replies exchanged while drafting [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md).

---

## Turn 1

### User

> create subdirectories
> Cpp_Spec_driven_TextFinder_Entry,
> Cpp_Spec_driven_Cmdline,
> Cpp_Spec_driven_Dirnav,
> Cpp_Spec_driven_Output

### Assistant

Created the four component subdirectories under [Cpp_Spec_driven_TextFinder/](..):

- [Cpp_Spec_driven_TextFinder_Entry/](.)
- [Cpp_Spec_driven_Cmdline/](../Cpp_Spec_driven_Cmdline/)
- [Cpp_Spec_driven_Dirnav/](../Cpp_Spec_driven_Dirnav/)
- [Cpp_Spec_driven_Output/](../Cpp_Spec_driven_Output/)

---

## Turn 2

### User

> Create Spec_Cpp_TextFinder_Entry.md using Spec_TextFinder.md and Cpp_Structure.md which will be used to build its code

### Assistant

Read [Spec_TextFinder.md](../../Spec_TextFinder.md) (Cpp_Structure.md was already in context), then created [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md) with nine sections:

1. **Purpose** — binary is the command-line entry point; contains no matching, I/O, or formatting.
2. **Scope** — covers only the binary; switch behavior lives in the parent Spec.
3. **Responsibilities** — imports the three libraries and `std`, owns the skip list, constructs Cpp_Output and Cpp_Dirnav (Dirnav templated on and bound to Output), drives traversal, handles `/H`, `/v`, exit codes, and top-level diagnostics.
4. **Startup Sequence** — `main(int argc, char* argv[])` in eight steps: parse via Cpp_Cmdline; handle `/H`; handle `/v`; instantiate Cpp_Output; instantiate Cpp_Dirnav; pass skip list to Cpp_Dirnav; traverse each `/P` root path; return exit code.
5. **Skip List** — binary-owned, initialized with the defaults from parent Spec §3.2, extended via `addSkipDirectory`.
6. **Multi-Path Handling** — `/P` accumulates roots in argv order; default `.` when none supplied.
7. **Exit Codes and Diagnostics** — 0 on success, non-zero when the command line was invalid or a root path could not be opened. Matches to stdout, diagnostics to stderr.
8. **Build** — C++23, CMake target producing executable `Cpp_TextFinder`. Entry is a conventional TU consuming the three modules and `import std;`.
9. **Non-Goals** — no file I/O, regex evaluation, formatting, or per-file state in the binary.

Flagged two open questions:

- **Format discrepancy**: [Cpp_Structure.md](../Cpp_TextFinder_Structure.md) said `path:line:text`; parent [Spec_TextFinder.md:56](../../Spec_TextFinder.md#L56) fixes the separator at ` - ` (space-hyphen-space).
- **Multi-path exit-code**: parent Spec §3.4 predates `/P` accumulation. Interpreted as "any unopenable root → non-zero, continue with the rest." Asked whether to short-circuit or ignore per-path failures instead.

---

## Turn 3

### User

> 1. use " - " format
> 2. change to display paths that cannot be opened.

### Assistant

Applied both:

- Updated [Cpp_Structure.md](../Cpp_TextFinder_Structure.md) to replace the `path:line:text` phrasing with "fields joined by ` - ` (space-hyphen-space, per Spec_TextFinder.md §3.4)."
- Updated [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md) Section 4 step 7, step 8, and Section 7 so unopenable root paths are diagnosed on stderr but no longer affect the exit code. Exit code non-zero is now reserved for invalid command lines only.

---

## Turn 4

### User

> In section 4., item 7. instead of writing error to stderr pass a "cannot open [directory] string to Output for display.

### Assistant

Edited Section 4 step 7 and Section 7 diagnostics bullet in [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md):

- Step 7 now passes the string `cannot open [path]` (with the actual path substituted) to `Cpp_Output` for display rather than writing to stderr.
- Section 7 now records that unopenable-path notices flow through `Cpp_Output`, while other diagnostics (usage errors, per-file skip announcements when `/h false`) continue to go to stderr.

Flagged an inconsistency with parent [Spec_TextFinder.md:64](../../Spec_TextFinder.md#L64), which routes diagnostics to stderr. Routing "cannot open" through `Cpp_Output` sends the notice to whatever stream `Cpp_Output` writes to (stdout if unchanged from the current design). To be reconciled in `Spec_Cpp_Output.md`.

---

## Turn 5

### User

> create Prompts_Spec_Cpp_TextFinder_Entry.md that contains all the prompts and replies used to create Spec_Cpp_TextFinder_Entry.md

### Assistant

Created this file, [Prompts_Spec_Cpp_TextFinder_Entry.md](Prompts_Spec_Cpp_TextFinder_Entry.md), summarizing the subdirectory-creation setup, the initial nine-section draft, and the two refinement turns (format decision plus routing "cannot open" through `Cpp_Output`). User prompts are quoted verbatim. Assistant replies are summarized from the actual responses; tool calls are noted as effects rather than transcribed.

Prompts_Fix_Spec_Cpp_TextFinder_Entry.md

# Prompts and Replies — Spec_Cpp_TextFinder_Entry Refinement

This file records the prompts and replies exchanged while refining [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md) after its initial draft and early edits. Turns 1–5 (subdirectory creation, initial draft, format decision, `cannot open` routing, and the first Prompts file) are recorded in [Prompts_Spec_Cpp_TextFinder_Entry.md](Prompts_Spec_Cpp_TextFinder_Entry.md).

---

## Turn 1

### User

> are there any ambiguities, omitted content, or other fixes needed for Spec_Cpp_TextFinder_Entry.md

### Assistant

Reviewed [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md) and listed thirteen items across four groups, without editing. Awaited user decisions.

**Ordering and lifecycle:**

1. Skip-list timing — Section 5 says Dirnav "receives the finalized list at construction," but Section 4 constructed Dirnav in step 5 and passed the skip list separately in step 6. Two-phase or constructor-argument?
2. `addSkipDirectory` in a CLI — the parent Spec exposes it as a public search interface; the CLI never calls it. Drop, keep, or reframe?
3. Multi-path Dirnav reuse — same instance across roots or fresh per root?

**Binding mechanisms:**

4. Step 5 "bound to the Cpp_Output instance" — constructor argument, setter?
5. Cpp_Output receives no configuration — is that correct, or does it need `/n`/`/L`/stream selection?

**Error handling holes:**

6. Regex compilation failure — when discovered, what exit code?
7. Cpp_Output construction failure — not addressed.

**Diagnostics precision:**

8. `/h false` — current wording says "skip announcements"; parent Spec covers every-file-searched and non-UTF-8 skip; needs broader wording.

**Platform / build gaps:**

9. Windows argv encoding — `char* argv[]` is system codepage.
10. Toolchain minimums for C++ Modules with `import std;`.
11. Concrete non-zero exit code value.

**Structural:**

12. Section 3 restates Section 4.
13. `argc` missing from Section 3.

---

## Turn 2

### User

Provided decisions on all thirteen items:

> 1. pass skip-list at Dirnav construction
> 2. allow Entry to call addSkipDirectory as a code change for new version.
> 3. reuse Dirnav
> 4. pass Output template type as Dirnav constructor argument
> 5. change Cpp_Output constructor to accept formatting information
> 6. Classify a malformed regex as invalid command argument.
> 7. Cpp_Output construction failure is program failure and should result in non-zero exit code.
> 8. "/h false" should send every found file to Output regardless of its match state.  "/h true" sends only matching files to Output.
> 9. Accept ASCII chars for C++
> 10. Place here
> 11. replace with 1
> 12. leave as is
> 13. fix as you've stated

### Assistant

Rewrote [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md) applying all thirteen decisions:

- Section 3: added Cpp_Output construction with formatting info; `Cpp_Dirnav` constructor takes the Cpp_Output instance and skip list; `argc` added alongside `argv`; `addSkipDirectory` reframed as code-level extension point.
- Section 4: startup sequence reordered. Step 5 finalizes the skip list; step 6 constructs `Cpp_Dirnav<Cpp_Output>` taking the Output instance, skip list, and parsed commands as constructor arguments — regex compilation happens here and a malformed regex classifies as invalid command argument. Malformed regex and Cpp_Output construction failure both exit `1`. Step 8 returns `0`.
- Section 5: `addSkipDirectory` documented as a code-level extension point (not runtime-exposed); skip list is a Dirnav constructor argument.
- Section 6: states a single reused `Cpp_Dirnav` instance across all roots; regex reused.
- Section 7: concrete exit code `1` covers three failure modes. `/h` semantics rewritten: `/h true` announces only files with matches through `Cpp_Output`; `/h false` announces every file examined through `Cpp_Output` regardless of match state. Usage diagnostics still go to stderr from the binary.
- Section 8: added toolchain minimums — GCC 14+, Clang 17+, MSVC 19.36+ (VS 2022 17.6+), CMake 3.28+.
- Section 9: added non-goal for non-ASCII argv on Windows (system-codepage argv not decoded to Unicode; ASCII only).

Section 3 vs Section 4 redundancy left as-is per decision 12.

---

## Turn 3

### User

> are there any text changes that would signiicantly reduce token count without losing precision of definition

### Assistant

Yes — estimated ~10–15%. Proposed five compressions with before/after excerpts:

- **Section 4 step 6** — merge Dirnav template-and-constructor sentences into one.
- **Section 5** — collapse the `addSkipDirectory` paragraph.
- **Section 7 bullets 1–2** — drop redundant enumeration ("regex compiled successfully," parse-failure list).
- **Section 8** — shorten the module bullet by referring to "the three libraries."
- **Section 9** — fold the non-ASCII bullet into a single sentence.

Confirmed precision preserved: same interfaces, exit codes, `/h` semantics, and toolchain minimums. Asked before applying.

---

## Turn 4

### User

> apply your fixes

### Assistant

Applied all five compressions to [Spec_Cpp_TextFinder_Entry.md](Spec_Cpp_TextFinder_Entry.md): step 6 collapsed; §5 addSkipDirectory paragraph shortened; §7 first two bullets tightened; §8 module bullet compacted; §9 non-ASCII bullet folded.

---

## Turn 5

### User

> create Prompts_Fix_Spec_Cpp_TextFinder_Entry.md with the prompts and replys that have not yet been written to an md file

### Assistant

Created this file, [Prompts_Fix_Spec_Cpp_TextFinder_Entry.md](Prompts_Fix_Spec_Cpp_TextFinder_Entry.md), documenting the review, the thirteen decisions, the compression proposals, and the applied compressions. User prompts are quoted verbatim. Assistant replies are summarized from the actual responses; tool calls are noted as effects rather than transcribed.