docs(adr): record the review outcomes for the Research registry grammar

- ADR-0004: add the "Amended by ADR-0028" note, following the ADR-0025
  convention.
- ADR-0028: correct Q5 (parse_status is gone), the skill count (38, not
  39), and the question order. Q7 records the anchored, format-only sha
  check. Q8 records the decision to commit real Vale fixtures. A new
  consequence covers path confinement and list rejection.
- CONTEXT.md: the `_Avoid_` entry means the bare noun, not the field.
- gates.md: correct the authored-hook counts after the corpus gate.
- create.md: a `none` entry backed by a reproduction must name committed
  fixtures in `Basis:`; use the `(digest: <full path>)` form.
- gitea-releases: use the `(digest: <full path>)` form.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EGHFJextYtVQseaHPDDhxB

CONTEXT.md

@@ -86,7 +86,7 @@ A plugin's research `sources.md` (e.g. `plugins/git/docs/research/docs/git/sourc
 headings are the source slugs. A skill's `Research doc:` field names exactly one, and
 `factory-audit` resolves each entry's slug against it. An entry with no registry declares
 `Research doc: none` and names what it was actually drawn from in `Basis:`.
-_Avoid_: research doc, sources file, topic doc (a topic doc is a digest of sources, not the registry)
+_Avoid_: bare "research doc" (the noun; `Research doc:` is the field name), sources file, topic doc (a topic doc is a digest of sources, not the registry)
 
 ### Governance