docs(provenance): migrate the corpus to the Research registry grammar

Repoint every `Research doc:` at the plugin's Research registry
(git/sources.md, pre-commit/sources.md, gitea/sources.md,
agentsmd/sources.md), keeping the old topic-doc link as a parenthetical
`(digest: ...)` annotation. Brace expansions and the gitea-releases
semicolon pair collapse to one path.

Entries with no registry (org-commit-conventions, org-git-conventions,
governance-secrets-hard-prohibition, adr-0002-0003-two-tier-claude-md)
now declare `none` plus `Basis:` bullets. The two git entries cite
core/instructions/git.md and commits.md as `(removed in 5deed07)`.

Remove the house-vale-3-15-2-repro entry and its source_keys citations
from vale-config and vale-run. It claimed six behaviours were reproduced
against purpose-built fixtures in this repo, but the entry was added in
d1afdbe with no test or fixture files, and none exists in history. The
behavioural rules stay; only the unbacked provenance claim goes.

Refs: #121
ADR: 0028
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EGHFJextYtVQseaHPDDhxB

plugins/gitea/.apm/skills/gitea-releases/references/sources.md

@@ -4,7 +4,7 @@
 
 - **URL:** https://gitea.com/gitea/gitea-mcp
 - **Description:** Official gitea-mcp repository; operation/*.go source files documenting the MCP tools, their parameters, and CLI flags. Originally extracted at v1.3.0; the input parameter schemas in `references/call-signatures.md` were re-verified live via `ToolSearch` against the deployed server, **last verified at v1.7.0** as reported by `get_gitea_mcp_server_version`.
-- **Research doc:** plugins/gitea/docs/research/docs/gitea/api-reference.md (Releases and Tags section); plugins/gitea/docs/research/docs/gitea/troubleshooting.md (`delete_release` numeric-id gotcha, `per_page` defaults)
+- **Research doc:** plugins/gitea/docs/research/docs/gitea/sources.md (digested in gitea/api-reference.md, Releases and Tags section, and gitea/troubleshooting.md, `delete_release` numeric-id gotcha and `per_page` defaults)
 
 **Contributing files:**
 - SKILL.md (Dispatch table, Gotchas)
@@ -16,7 +16,7 @@
 
 - **URL:** https://gitea.com/gitea/gitea-mcp/raw/branch/main/operation/repo/slim.go
 - **Description:** Slim response shape structs from gitea-mcp source; defines exactly which fields the MCP server returns for tags and releases.
-- **Research doc:** plugins/gitea/docs/research/docs/gitea/api-reference.md (Releases and Tags response shapes)
+- **Research doc:** plugins/gitea/docs/research/docs/gitea/sources.md (digested in gitea/api-reference.md, Releases and Tags response shapes)
 
 **Contributing files:**
 - references/call-signatures.md (release/tag object shapes)
@@ -27,7 +27,7 @@
 
 - **URL:** context7:/websites/gitea
 - **Description:** Official Gitea docs mirror on Context7 (docs.gitea.com content) — release and tag semantics, draft/prerelease behavior.
-- **Research doc:** plugins/gitea/docs/research/docs/gitea/workflow-conventions.md (Release and tag conventions section)
+- **Research doc:** plugins/gitea/docs/research/docs/gitea/sources.md (digested in gitea/workflow-conventions.md, Release and tag conventions section)
 
 **Contributing files:**
 - SKILL.md (Gotchas — draft/prerelease as explicit flags)
@@ -39,7 +39,7 @@
 
 - **URL:** context7:/git_gitea_com/gitea_tea
 - **Description:** Official `tea` CLI (reference Gitea client) docs on Context7 — practitioner release/tag command patterns, semver tag conventions, draft/prerelease flags, release-notes-from-file conventions.
-- **Research doc:** plugins/gitea/docs/research/docs/gitea/workflow-conventions.md (Release and tag conventions section)
+- **Research doc:** plugins/gitea/docs/research/docs/gitea/sources.md (digested in gitea/workflow-conventions.md, Release and tag conventions section)
 
 **Contributing files:**
 - references/conventions.md (semver tag naming, release-notes sourcing)