chore: bootstrap repo with chunks 1 and 2

Establishes the global AI development config repo from scratch:

- Chunk 1: repo skeleton, install.sh, statusline, deploy manifest
- Chunk 2: core instructions (coding/git/testing), CLAUDE.md rewrite
  (always-on + content index two-tier model), docs restructure,
  6 ADRs, ROADMAP.md, .gitkeep placeholders
- Bootstrap skills in .claude/skills/ (to be catalogued and migrated
  to .agents/skills/ in Chunk 3)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/issues/0001-repo-skeleton-content-files.md

@@ -0,0 +1,23 @@
+# 0001 — Repo skeleton: content files ✅
+
+## What to build
+
+Create the three content files that `install.sh` will deploy. This establishes the repo skeleton and makes the global Claude Code config a real, version-controlled artifact.
+
+- `providers/claude-code/CLAUDE.md` — fill in the two-tier structure: one always-on rule ("when you need workflows, agents, or prompts, read them from `~/.claude/core/`") plus a content index section with pointers to `~/.claude/core/` (initially sparse, populated as chunks complete)
+- `providers/claude-code/settings.json` — `{"theme": "dark"}`
+- `core/instructions/global.md` — placeholder stub confirming the pipeline works; real content comes in Chunk 2
+
+The root `CLAUDE.md` and `providers/claude-code/CLAUDE.md` already exist as shells with warnings — this issue fills in the real content of `providers/claude-code/CLAUDE.md`.
+
+## Acceptance criteria
+
+- [ ] `providers/claude-code/CLAUDE.md` has a short always-on section with the content index rule and a pointers section referencing `~/.claude/core/`
+- [ ] `providers/claude-code/settings.json` contains `{"theme": "dark"}`
+- [ ] `core/instructions/global.md` exists as a clearly-labelled placeholder stub
+- [ ] No empty directories committed (`core/agents/`, `core/workflows/`, `core/prompts/` do not exist yet)
+- [ ] `providers/claude-code/CLAUDE.md` warning banner distinguishes it from the root `CLAUDE.md`
+
+## Blocked by
+
+None — can start immediately.