fix(bin): put five skills' boundaries where the router can read them

grill-me, grill-with-docs, improve-codebase-architecture, tdd and triage each had
their routing boundary written into README.md, which nothing loads at runtime,
while the gate still reported all five descriptions as boundary-less. The
boundaries move into the descriptions; write-docs' clause, which said 'those have
dedicated skills' without naming one, now names them.

research had moved its body out and then read both references unconditionally --
the anti-goal ADR-0020 names, where the word count moves and the per-run context
does not. Both loads are genuinely conditional now, with the topic list and the
four literal sources.md field names inlined, since the provenance validator
matches those literally.

Also restores the promote-the-prototype anti-pattern to prototype's ui.md, which
the gate does not measure, so deleting it bought nothing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EJJrm5YmacbwMdzZpXcoti

plugins/bin/skills/research/SKILL.md

@@ -30,7 +30,10 @@ model: sonnet
 
 Search for existing use of the topic — imports, config files, version pins, reference files already written — and narrow the research to what is missing: the version actually in use, the topics not yet documented.
 
-Read `references/topics.md` before narrowing, for the default topic list.
+The default topic areas are `overview`, `installation`, `configuration`, `cli-reference`,
+`api-reference`, `examples` and `troubleshooting` — one file each, and only where content exists.
+If what belongs in one of them is unclear, or the topic needs a file outside that set, read
+`references/topics.md` for the per-topic coverage table and the custom-topic naming rule.
 
 ## Step 2 — Resolve against Context7
 
@@ -56,11 +59,20 @@ If nothing usable comes back, stop and report what was searched, then ask for st
 
 ## Step 6 — Write
 
-Merge every set of notes, Context7 and web alike, by topic area. Read `references/file-format.md`, then write, in the output path:
+Merge every set of notes, Context7 and web alike, by topic area, then write, in the output path:
 
-- `<topic>.md` for each topic area that has content, default or custom
-- `sources.md`, always, one section per source in the schema that file gives — URL, description, contributing files, and status — including sources that yielded nothing, marked `no content extracted`
+- `<topic>.md` for each topic area that has content, default or custom. Frontmatter carries `topic:` (the filename without `.md`) and `source_keys:` (kebab-case slugs matching `sources.md`); the body is prose in `##` sections, with no inline URLs.
+- `sources.md`, always, one `##` section per source — including sources that yielded nothing — with exactly these four fields:
 
-Spell the `sources.md` field names exactly as `references/file-format.md` gives them. The downstream provenance validator matches them literally; prose in their place parses as nothing, and the check passes having verified nothing.
+  ```markdown
+  - **URL:** <full URL>
+  - **Description:** <one-line summary>
+  - **Contributing files:** <topic files this source contributed to>
+  - **Status:** `extracted` | `no content extracted`
+  ```
+
+Spell those four field names exactly as given. The downstream provenance validator matches them literally; prose in their place parses as nothing, and the check passes having verified nothing.
+
+Read `references/file-format.md` when the four fields above do not settle the case: what a slug should be, the `context7-<library-slug>` slug and `context7:<library-id>` URL convention for a Context7 source, or what belongs in a topic body versus a verbatim copy of the source.
 
 If no topic area has content, write nothing at all, `sources.md` included, and report what was searched.