feat(glossary): add optional paths.glossary standing-reading slot

Pins canonical nomenclature per project so terminology does not drift
and LLM-driven work reuses the established term instead of coining a
synonym each session. The glossary rides the existing standing-reading
mechanism — one optional path slot, no new delivery path.

Single-sourcing, to avoid cross-doc drift:
- `paths.glossary` row in profile-schema.md owns the "set => standing
  reading for every role; unset => no-op" semantics; agent-template.md
  and pipeline.md each carry one referencing sentence, not a restatement.
- glossary-convention.md owns the format (flat per-term blocks: canonical
  heading + Avoid line + <=2-sentence definition) and the boss
  record-reality-never-invent write-rule; boss/SKILL.md only points to it.
- glossary.md dogfoods the format on the plugin's own vocabulary
  (cycle, milestone, iteration, drift, hard-gate).

Write authority: user any time; boss autonomously but only to record
terms already in consistent use or to settle a drift it just resolved —
never to coin. All other roles are read-only consumers.

No executable surface; this repo has no test runner, so each task closed
on a grep presence-assertion against the file it touched. All eight gates
green (T1 3>=3, T2 5, T3 2, T4 1, T5 1, T6 1, T7 2, final sweep present).

Implements docs/specs/2026-05-31-glossary-integration-design.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/pipeline.md

@@ -176,3 +176,7 @@ a different gate set (e.g. `planner` without a `brainstorm`
 gate, for trivial bug-fix iterations) configures it there.
 
 See `profile-schema.md` for the syntax.
+
+If the profile sets `paths.glossary`, that file is standing reading
+for every role — the canonical-nomenclature source every skill and
+agent consults (see `glossary-convention.md`). Unset, it is a no-op.