docs: deploy the ai-constitution with core so the governance pointer resolves

Why: the always-on governance.md told agents to read
docs/ai-constitution.md when a decision is not covered, a path that
exists only in this repo, so the fallback failed in every other project.
(Simplification audit finding 27, second defect.)

Implementation Notes:
- Move docs/ai-constitution.md to core/ai-constitution.md; the existing
  core deploy step now ships it to ~/.claude/core/.
- governance.md line 4 and line 73 name ~/.claude/core/ai-constitution.md;
  the HUMANS.md and CONTROLS.md pointers now say they live in the
  holocron repo.
- Repoint path-qualified citations in AGENTS.md, architecture.md,
  skill-implementation-workflow.md and CONTROLS.md. The vendored
  write-skill example and the audit's historical notes are left as
  records.
- The docs/wiki gitlink is not bumped here; the wiki commit awaits push.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/spec/architecture.md

@@ -61,7 +61,7 @@ Plugin-root documentation belongs in `docs/`. That convention is older than the
 Those on-demand files are plain markdown — no frontmatter, no schema. The agent decides when to read each one from task context and the content index label alone. Frontmatter is deferred until there is evidence that agents are loading the wrong files in practice; it is a deliberate deferral, not an oversight to close.
 
 The governance layer has two phases:
-- **Phase 1** (complete): instruction and documentation layer — `governance.md` loaded via `@import`; `docs/ai-constitution.md` and `docs/wiki/HUMANS.md` as human-facing reference; `CONTEXT.md` extended with governance domain language.
+- **Phase 1** (complete): instruction and documentation layer — `governance.md` loaded via `@import`; `core/ai-constitution.md` and `docs/wiki/HUMANS.md` as human-facing reference; `CONTEXT.md` extended with governance domain language.
 - **Phase 2** (planned): deterministic enforcement layer — pre-commit hooks, CI gates, secret scanning, licence scanning. Specified in `docs/research/governance_principles/CONTROLS.md`.
 
 ## AGENTS.md pattern