chore(#191): retire the gsd-sdk shim — route everything at gsd-tools (#522)

* chore(#191): migrate gsd-sdk query call sites to gsd-tools query

Retiring the gsd-sdk shim. gsd-tools.cjs already accepts `query` as a
meta-prefix (gsd-tools query <command>), so this is a behavior-preserving 1:1
swap across the runtime reference prompts, the graphify hook's commit-detection
gate, and two bin/lib comment/message references.

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

* chore(#191): remove vestigial gsd-sdk shim code from installer + projection

The gsd-sdk shim was already not wired up (no gsd-sdk bin in package.json;
buildWindowsShimTriple had zero call sites). Remove the dead code:
- shell-command-projection.cjs: buildWindowsShimTriple + formatSdkPathDiagnostic
  (+ their now-unused PACKAGE_NAME import) and exports
- install.js: the re-export wrappers + imports, the #3406 stale-standalone-sdk
  detection (detectStaleStandaloneSdk/formatStaleStandaloneSdkWarning + its
  global-install call site), and the exports

Preserved (retained, not gsd-sdk): buildCodexHookWindowsShimIR (#3426) — only
its comments referenced the gsd-sdk pattern; reworded. Also kept the
homePathCoveredByRc 'reopen your shell' branch in maybeSuggestPathExport — its
logic is bin-dir-agnostic, only the message mentioned gsd-sdk; reworded to use
the actual bin dir.

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

* test(#191): update tests for retired gsd-sdk shim

- bug-3441/bug-3442: drop the formatSdkPathDiagnostic / buildWindowsShimTriple
  assertions (functions removed); retained PATH-action + drift-guard tests stay
- bug-505: remove the 'still exported' assertions for detectStaleStandaloneSdk /
  formatStaleStandaloneSdkWarning / the shim contract surface (#505 kept them;
  #191 removes them)
- graphify-auto-update: migrate the hook-dispatch inputs gsd-sdk query commit ->
  gsd-tools query commit to match the migrated commit hook

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

* docs(#191): point active docs at gsd-tools query (gsd-sdk shim retired)

Update the user/agent-facing docs (AGENTS, COMMANDS, CONFIGURATION, USER-GUIDE,
ship-pr-body-sections) that presented gsd-sdk query as a current command to
gsd-tools query. Historical docs (ADRs, PRDs, release notes) left untouched.

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

* docs(#191): correct state.load vs state.json description for gsd-tools query

Adversarial-review (codex) finding: the migrated USER-GUIDE line claimed both
'gsd-tools query state.json' and 'state.load' resolve to the frontmatter-rebuild
handler. Verified they don't — state.load returns the CJS load shape
(config + state_raw + flags), state.json returns the frontmatter shape. Both are
available via gsd-tools query; corrected the text to say so.

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

* chore(#191): add changeset for gsd-sdk shim retirement

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

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

get-shit-done/references/git-integration.md

@@ -51,7 +51,7 @@ Phases:
 What to commit:
 
 ```bash
-gsd-sdk query commit "docs: initialize [project-name] ([N] phases)" --files .planning/
+gsd-tools query commit "docs: initialize [project-name] ([N] phases)" --files .planning/
 ```
 
 </format>
@@ -136,7 +136,7 @@ SUMMARY: .planning/phases/XX-name/{phase}-{plan}-SUMMARY.md
 What to commit:
 
 ```bash
-gsd-sdk query commit "docs({phase}-{plan}): complete [plan-name] plan" --files .planning/phases/XX-name/{phase}-{plan}-PLAN.md .planning/phases/XX-name/{phase}-{plan}-SUMMARY.md .planning/STATE.md .planning/ROADMAP.md
+gsd-tools query commit "docs({phase}-{plan}): complete [plan-name] plan" --files .planning/phases/XX-name/{phase}-{plan}-PLAN.md .planning/phases/XX-name/{phase}-{plan}-SUMMARY.md .planning/STATE.md .planning/ROADMAP.md
 ```
 
 **Note:** Code files NOT included - already committed per-task.
@@ -156,7 +156,7 @@ Current: [task name]
 What to commit:
 
 ```bash
-gsd-sdk query commit "wip: [phase-name] paused at task [X]/[Y]" --files .planning/
+gsd-tools query commit "wip: [phase-name] paused at task [X]/[Y]" --files .planning/
 ```
 
 </format>
@@ -287,7 +287,7 @@ Set `commit_docs: false` so planning docs stay local and are not committed to an
 Instead of the standard `commit` command, use `commit-to-subrepo` when `sub_repos` is configured:
 
 ```bash
-gsd-sdk query commit-to-subrepo "feat(02-01): add user API" \
+gsd-tools query commit-to-subrepo "feat(02-01): add user API" \
   --files backend/src/api/users.ts backend/src/types/user.ts frontend/src/components/UserForm.tsx
 ```