Fix README links, add missing skills, correct invocation classification

- Fixed 3 broken links in root and common READMEs (pkm-curation,
  forge-interaction, forge-preferences were pointing to wrong buckets)
- Moved project-context-pack from model-invoked to user-invoked
  (matches its disable-model-invocation: true flag)
- Added 8 missing user-invoked and 6 missing model-invoked skills
  to root and common READMEs
- Added all 9 engineering skills to engineering README
  (was missing codebase-design, domain-modeling, resolving-merge-conflicts,
  tdd, grill-with-docs, improve-codebase-architecture, setup-skills,
  to-issues, to-prd, triage)
- Added pkm-curation to pkm README
- Updated personal README to note both skills moved elsewhere
- Added all forge skills to deprecated README
- Added .gitignore for docs/adr/
- Added docs/agents/ reference files
- Added project context cache

docs/agents/adr-wiki.md

@@ -0,0 +1,66 @@
+# ADR Wiki
+
+Architecture Decision Records live on the forge wiki and are cloned into `docs/adr/` during setup.
+
+## Wiki URL
+
+```
+git@gitea.sagacity.ca:steve/Skills.wiki.git
+```
+
+Derived from the forge remote during `/setup-skills`.
+
+## Bootstrap
+
+On first setup, `/setup-skills` clones the wiki:
+
+```bash
+git clone git@gitea.sagacity.ca:steve/Skills.wiki.git docs/adr/
+```
+
+And adds `docs/adr/` to `.gitignore`.
+
+On subsequent sessions, pull the latest:
+
+```bash
+cd docs/adr/ && git pull --rebase
+```
+
+## Auth
+
+Authentication for pushing ADR changes uses: **SSH key**
+
+The wiki remote uses `git@gitea.sagacity.ca:steve/Skills.wiki.git` — same SSH key used for the source repo.
+
+## Session-end push
+
+At end of every session, the agent:
+
+1. `cd docs/adr/ && git add -A && git commit -m "docs(adr): <action> ADR-NNNN — <description>"`
+2. `git pull --rebase` (handle any web UI edits)
+3. `git push`
+
+If a conflict arises during rebase, surface it to the user for resolution.
+
+## Commit message convention
+
+```
+docs(adr): add ADR-NNNN — title
+docs(adr): update ADR-NNNN — reason
+docs(adr): remove ADR-NNNN — superseded by ADR-NNNN
+```
+
+## Consumer skills
+
+These skills read from `docs/adr/` by relative path — the wiki clone is transparent:
+
+- `diagnosing-bugs`
+- `tdd`
+- `improve-codebase-architecture`
+- `domain-modeling`
+- `grill-with-docs`
+
+These skills may create ADRs in `docs/adr/`; the wiki push is handled at session end:
+
+- `domain-modeling`
+- `improve-codebase-architecture`