feat(3081): auto-trim review prompts for small-context model reviewers (#3708)

* feat(3081): auto-trim review prompts for small-context model reviewers

Adds review.max_prompt_tokens and review.max_prompt_tokens_per_reviewer
config keys. When configured, the /gsd-review workflow deterministically
trims the assembled prompt before sending to each reviewer (drop CONTEXT
→ RESEARCH → REQUIREMENTS; head-shrink PROJECT.md; tail-truncate PLANs
proportionally; reserve disclosure-note tokens upfront). Trim metadata
is recorded in REVIEWS.md frontmatter. Reviewer is skipped with a
warning if even the minimum review set exceeds the budget.

Closes #3081

* fix(3081): register prompt-budget in SDK query registry and update inventory manifest

review.md references `gsd-sdk query prompt-budget` at three call sites, but the
command had no handler in the SDK registry — failing the registry-integration
drift-guard test on all 6 CI matrix legs. Added a native TypeScript SDK handler
(sdk/src/query/prompt-budget.ts) that ports the applyBudget logic from the CJS
module, registered it in DOMAIN_STATIC_CATALOG, and regenerated
docs/INVENTORY-MANIFEST.json to include the new cli_modules/prompt-budget.cjs entry.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(3081): bump ws to 8.20.1 and allowlist prompt-budget sibling pair

Two additional CI failures after the registry fix:

1. ws moderate CVE (GHSA-58qx-3vcg-4xpx, uninitialized memory disclosure):
   The advisory covers ws >=8.0.0 <8.20.1. Both root and sdk/package.json
   pinned ^8.20.0 which resolved to 8.20.0. Bumped both to 8.20.1 to clear
   the npm audit drift-guard test (bug-3588-npm-audit-clean.test.cjs).

2. lint-shared-module-handsync detected the new prompt-budget.ts / prompt-budget.cjs
   sibling pair without an allowlist entry. Added a cooperatingSiblings entry
   to scripts/shared-module-handsync-allowlist.json with classification and
   justification matching the established pattern.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(3081): align prompt-budget skip semantics across CJS and SDK dispatch paths

Replace brittle `[ $EXIT -eq 2 ]` guards with `[ $EXIT -ne 0 ]` in all three
local-reviewer blocks (Ollama, LM Studio, llama.cpp) in workflows/review.md.
Any non-zero exit from prompt-budget now triggers a skip with a descriptive
warning — exit 2/11 prints "budget too small", any other non-zero prints
"unexpected exit code". This ensures the SDK bridge dispatch path (exit 11
via GSDError(Blocked)) triggers the same skip as the CJS path (exit 2).

The SDK handler (sdk/src/query/prompt-budget.ts) already writes both metadata
and prompt files before throwing, so no change needed there.

The Ollama block also gains the missing OLLAMA_SKIP guard so the reviewer
invocation is actually skipped (previously the block only suppressed the
OLLAMA_PROMPT_FILE update but still ran the curl invocation).

SDK integration path (hardFailed via GSDError(Blocked) → exit 11) is covered
by handler unit tests in tests/prompt-budget.test.cjs; no gsd-sdk-*.test.cjs
exercising the full bridge dispatch for this command exists yet — that gap
remains and is documented here.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix prompt-budget trim ordering and review guard follow-ups

* perf: optimize prompt-budget and dedup reviewer trim workflow

* fix(3708): drop source-grep theater tests to satisfy lint-no-source-grep

All four test files added in commit 2df566ed were pure source-grep theater:
they read .cjs / .ts / .md source files and asserted that specific string
literals were present or absent. None exercised runtime behaviour.

Deleted:
- tests/gsd-tools-memory-optimizer.test.cjs   — 7 includes() on gsd-tools.cjs
- tests/prompt-budget-hotpath-optimizer.test.cjs — includes() on prompt-budget.cjs + .ts
- tests/prompt-budget-io-optimizer.test.cjs   — includes() on prompt-budget.ts + gsd-tools.cjs
- tests/review-workflow-budget-dedup.test.cjs — includes() on review.md

Behavioural coverage for the prompt-budget feature already exists in
tests/prompt-budget.test.cjs and tests/prompt-budget-cli.test.cjs (also
added by this PR). No replacement tests needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(3708): correct budget-pressure threshold and minSet accounting

Two bugs in applyBudget caused premature trimming and false hard-fails:

1. UNNEEDED_TRIM: budgetUnderPressure compared baseTokens against
   effectiveBudget - NOTE_RESERVE_TOKENS, triggering trim pressure 80
   tokens before the budget was actually exceeded. Fix: compare against
   effectiveBudget directly; NOTE_RESERVE_TOKENS are still reserved in
   contentBudget once real pressure is confirmed.

2. FALSE_HARDFAIL: minSet included NOTE_RESERVE_TOKENS unconditionally,
   treating the note as mandatory even when no trim would occur and no
   note would be injected. Fix: exclude NOTE_RESERVE_TOKENS from minSet;
   a prompt that fits untrimmed needs no note and must not hard-fail.

Both fixes applied in CJS and TypeScript implementations. Two regression
tests added (cycles 11 and 12) that reproduce each case behaviorally.

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>