fix(#1041): route all source agents through the canonical multi-runtime gsd-tools resolver (#1045)

* fix(#1041): route all source agents through the canonical multi-runtime gsd-tools resolver

Source agents/*.md (gsd-planner, gsd-executor, gsd-verifier, gsd-plan-checker,
gsd-intel-updater, gsd-debugger, …) called bare "gsd-tools …" in shell blocks.
On a shim-only install — where gsd-tools.cjs exists under the runtime home but
gsd-tools is NOT on PATH — those calls fail with "command not found" and the
agent silently skips init/state/validate/commit ceremony, deferring to the
orchestrator or bypassing GSD bookkeeping entirely.

were never migrated, so it persisted on Claude Code and every other runtime that
consumes the source agents directly. Only gsd-phase-researcher.md carried a
resolver — and a stale, claude-only truncated one.

Fix (all runtimes):
- Inject the canonical multi-runtime gsd_run preamble (byte-equal to
  _runtime-launcher.snippet.sh — claude/codex/cursor/gemini/copilot/windsurf/
  augment/trae/qwen/cline/opencode/kilo/hermes/antigravity homes) at the top of
  the first gsd_run block of all 12 gsd-tools-calling agents, and rewrite every
  command-position bare gsd-tools to gsd_run.
- Upgrade gsd-phase-researcher.md's stale resolver to the canonical one.
- Extend scripts/sync-runtime-launcher.cjs to maintain agents/ in parity (the
  sync caught and corrected a mis-placed preamble during development).
- Extend the bare-gsd-tools (#2851) and launcher-parity (#373) regression guards
  to agents/ so no runtime can silently regress.

Closes #1041

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#1041): backfill changeset PR number to 1045

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

docs/INVENTORY.md

@@ -264,7 +264,7 @@ Full roster at `gsd-core/workflows/*.md`. Workflows are thin orchestrators that
 
 ---
 
-## References (67 shipped)
+## References (68 shipped)
 
 Full roster at `gsd-core/references/*.md`. References are shared knowledge documents that workflows and agents `@-reference`. The groupings below match [`docs/ARCHITECTURE.md`](ARCHITECTURE.md#references-gsd-corereferencesmd) — core, workflow, thinking-model clusters, and the modular planner decomposition.
 
@@ -354,6 +354,7 @@ The `gsd-planner` agent is decomposed into a core agent plus reference modules t
 | `planner-antipatterns.md` | Planner anti-patterns and specificity examples. |
 | `planner-chunked.md` | Chunked mode return formats (`## OUTLINE COMPLETE`, `## PLAN COMPLETE`) for Windows stdio hang mitigation. |
 | `planner-gap-closure.md` | Gap-closure mode behavior (reads VERIFICATION.md, targeted replanning). |
+| `planner-guidance.md` | Expository planner guidance: philosophy, task types/sizing, interface-first ordering, user setup, dependency graph, granularity calibration, and structured-return templates. |
 | `planner-reviews.md` | Cross-AI review integration (reads REVIEWS.md from `/gsd-review`). |
 | `planner-revision.md` | Plan revision patterns for iterative refinement. |
 | `planner-source-audit.md` | Planner source-audit and authority-limit rules. |