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/git/.apm/skills/pc-run/references/sources.md

@@ -5,7 +5,7 @@
 - **URL:** context7:/pre-commit/pre-commit.com
 - **Description:** Official pre-commit.com documentation — installation, configuration schema, CLI reference, hook authoring, advanced features, troubleshooting
 - **Contributing files:** SKILL.md, references/install.md, references/autoupdate.md, references/clean.md, references/failure-patterns.md
-- **Research doc:** plugins/git/docs/research/docs/pre-commit/{overview,cli-reference,troubleshooting}.md
+- **Research doc:** plugins/git/docs/research/docs/pre-commit/sources.md (digest: plugins/git/docs/research/docs/pre-commit/overview.md, plugins/git/docs/research/docs/pre-commit/cli-reference.md, plugins/git/docs/research/docs/pre-commit/troubleshooting.md)
 - **Status:** `extracted`
 
 ## pre-commit-com
@@ -13,7 +13,7 @@
 - **URL:** https://pre-commit.com/
 - **Description:** Pre-commit framework homepage — full docs covering install, config, CLI, hook authoring, stages, local hooks, meta hooks, hazmat helpers, CI integration
 - **Contributing files:** SKILL.md, references/install.md, references/autoupdate.md, references/clean.md, references/failure-patterns.md
-- **Research doc:** plugins/git/docs/research/docs/pre-commit/{overview,cli-reference,troubleshooting}.md
+- **Research doc:** plugins/git/docs/research/docs/pre-commit/sources.md (digest: plugins/git/docs/research/docs/pre-commit/overview.md, plugins/git/docs/research/docs/pre-commit/cli-reference.md, plugins/git/docs/research/docs/pre-commit/troubleshooting.md)
 - **Status:** `extracted`
 
 ## context7-pre-commit-hooks
@@ -21,7 +21,7 @@
 - **URL:** context7:/pre-commit/pre-commit-hooks
 - **Description:** Official pre-commit-hooks collection — all available hook IDs with options and examples
 - **Contributing files:** (none)
-- **Research doc:** plugins/git/docs/research/docs/pre-commit/hooks-reference.md § "pre-commit-hooks (official collection)"
+- **Research doc:** plugins/git/docs/research/docs/pre-commit/sources.md (digest: plugins/git/docs/research/docs/pre-commit/hooks-reference.md § "pre-commit-hooks (official collection)")
 - **Status:** `extracted`
 
 ## pre-commit-hooks-github
@@ -29,5 +29,5 @@
 - **URL:** https://raw.githubusercontent.com/pre-commit/pre-commit-hooks/main/README.md
 - **Description:** Official pre-commit-hooks README — complete hook listing with all args, categories, deprecated hooks, and latest version
 - **Contributing files:** (none)
-- **Research doc:** plugins/git/docs/research/docs/pre-commit/hooks-reference.md § "pre-commit-hooks (official collection)"
+- **Research doc:** plugins/git/docs/research/docs/pre-commit/sources.md (digest: plugins/git/docs/research/docs/pre-commit/hooks-reference.md § "pre-commit-hooks (official collection)")
 - **Status:** `extracted`