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/0003-statusline.md

@@ -0,0 +1,42 @@
+# 0003 — Claude Code status line ✅
+
+## What to build
+
+Add a custom status line to the Claude Code provider that shows session context at a glance. The status line is a bash script that reads JSON from stdin on every Claude Code render event and prints a formatted, colored line.
+
+Segments (left to right — identity → config → health):
+- **Directory** — basename of working dir (bold blue)
+- **Git branch** — green on feature branches, red on `main`/`master`
+- **Model** — colored by cost tier: Haiku green, Sonnet amber, Opus red
+- **Context %** — model-aware thresholds: Opus 55/75%, Sonnet 65/85%, Haiku 75/90%; green → amber → red
+- **Cost** — session cost in USD; shown as ¢ below $1, $X.XX above; green → amber at $1.50 → red at $3.00
+- **Tokens** — cumulative session total, formatted as Xk when ≥ 1000; blue (informational only)
+- **Vim mode** — magenta, only shown when active
+
+Segments joined with ` · `. Missing or zero-value segments are omitted entirely.
+
+Files:
+- `providers/claude-code/statusline-command.sh` — the script
+- `providers/claude-code/settings.json` — updated with `statusLine` config
+- `scripts/install.sh` — updated to deploy the script and set executable bit
+
+## Acceptance criteria
+
+- [x] `providers/claude-code/statusline-command.sh` exists and is executable
+- [x] `settings.json` references the script via `statusLine.command`
+- [x] `install.sh` deploys the script to `~/.claude/statusline-command.sh` with `chmod +x`
+- [x] All segments render correctly with ANSI colors (no literal `\033[0m` in output)
+- [x] Segments separated by ` · `, not `|`
+- [x] Cost shown as ¢ below $1, $X.XX above
+- [x] Tokens shown as Xk when ≥ 1000, raw number below
+- [x] Missing fields produce no empty segment
+- [x] `tests/test-statusline.sh` passes (11 tests)
+- [x] `tests/test-install.sh` passes (now covers statusline deployment)
+
+## Cost threshold rationale
+
+On a $20/month subscription, `total_cost_usd` measures session weight rather than real spend. Thresholds ($1.50 amber / $3.00 red) are calibrated to signal a heavy session, not budget overrun. Adjust upward if amber rarely appears.
+
+## Blocked by
+
+- 0002 — install.sh