fix: re-anchor doc citations that the CONTEXT.md trim broke

Why: eight comments and one status note cited CONTEXT.md or AGENTS.md text that
b9c7762 and 1929ffd moved or deleted. All are inert at runtime, but they are the
rationale comments that tell the next maintainer why an assertion exists, and
they now name a file that no longer explains it.

Implementation notes: re-anchored by what the citation is for, not uniformly.
- Four sites quoted facts ADR-0013 owns — every rule is `level: error` with no
  ignorable tier (ADR-0013:59-70), and KyberforgeCopilot's `.agent.md`-only
  scope (ADR-0013:43-46). These now cite ADR-0013. ADRs are append-only here;
  the spec docs are refactored, which is what caused this rot.
- Two sites quoted the glob location-independence property, which no ADR owns.
  The quote was already inline and carried the full rationale, so the citation
  added a rot surface and no information — dropped, statement kept.
- sync-marketplace-mirror.sh's header attributed the mirror-not-a-profile fact
  to CONTEXT.md; the parenthetical beside it already carries the evidence, so
  the attribution is dropped rather than re-pointed.
- .pre-commit-config.yaml cited an AGENTS.md instruction that no longer exists;
  generalised to "the documented instruction".
- LESSONS.md:29 misquoted AGENTS.md's current session-start line.

Also corrects a pre-existing misattribution at tests/test-vale-wrap.sh:454:
AGENTS.md has never named bash 3.2 as a repo target (`git log -S'3.2'` on it is
empty). LESSONS.md and the script headers do.

Impact: no behaviour change. test-check-vale-style-sync.sh and test-vale-wrap.sh
both pass (42 passed, 0 failed).

scripts/check-vale-style-sync.sh

@@ -127,8 +127,8 @@ for ini in "$SKILL_INI" "$AGENT_INI"; do
     err "$rel_ini has no section whose BasedOnStyles names Kyberforge — every rule the audit prefilters on lives in that style"
   fi
   # Per-rule overrides are the third way to retire a rule without touching a
-  # style file or a glob. CONTEXT.md's "Vale audit prefilter" entry: "Every rule
-  # is `level: error` and every alert is a FAIL — no ignorable tier". Vale's exit
+  # style file or a glob. Per ADR-0013, every rule is `level: error` and every
+  # alert is a FAIL — there is no ignorable tier. Vale's exit
   # code keys on `error` alerts alone, so any override that leaves a rule at
   # anything other than `error` still lints the file, still exits 0, and still
   # shows `Passed` in pre-commit. The glob probe below cannot backstop this: it
@@ -175,9 +175,10 @@ for ini in "$SKILL_INI" "$AGENT_INI"; do
   fi
 done
 
-# KyberforgeCopilot is agent-audit's alone — CONTEXT.md describes it as "scoped
-# only to `.agent.md` files for the Copilot-only 'Use proactively has no effect'
-# check". The loop above deliberately asserts only `Kyberforge`, since
+# KyberforgeCopilot is agent-audit's alone — ADR-0013 scopes it to `.agent.md`
+# files only, for the Copilot-only 'Use proactively has no effect' check, and
+# records that it must not be extended to `.md` files. The loop above
+# deliberately asserts only `Kyberforge`, since
 # skill-audit's copy legitimately has no Copilot style, so dropping
 # `, KyberforgeCopilot` from agent-audit's `[**/*.agent.md]` section unloaded the
 # whole style silently: no glob broke, the styles/ diff above stayed clean (the
@@ -353,10 +354,10 @@ while IFS='|' read -r skill rel scope; do
 # `.pre-commit-config.yaml`'s regex correctly no longer matches it and that's
 # not drift. `demo.agent.md` is the real, current shape and is `shared`.
 #
-# The two `.claude/`-prefixed probes carry the location-independence CONTEXT.md
-# asserts: "A `SKILL.md` outside `plugins/` (e.g. project-scope
+# The two `.claude/`-prefixed probes carry the location-independence property: a
+# `SKILL.md` outside `plugins/` (e.g. project-scope
 # `.claude/skills/foo/SKILL.md`) still matches `[**/SKILL.md]` and gets linted
-# normally — the globs constrain filename shape, not location." Every other
+# normally — the globs constrain filename shape, not location. Every other
 # probe here starts with `plugins/`, so narrowing a glob to a `plugins/`-shaped
 # path (`[**/SKILL.md]` -> `[**/.apm/skills/*/SKILL.md]`) left all of them
 # matching while the project-scope shape started linting as `0 errors ... in 0