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/adr/0001-pull-distribution-model.md

@@ -0,0 +1,3 @@
+# Pull distribution model
+
+Projects pull config updates from this repo consciously rather than receiving automatic pushes. We chose pull because it keeps projects in control of when they take updates — a silent push could break a project mid-sprint with no warning. Pull also scales cleanly from solo homelab to open source: anyone can fork this repo and projects remain decoupled from the origin. The trade-off is that stale projects are invisible until they pull; push would make fleet drift detectable earlier, which is why fleet sync tooling (Phase 2) revisits this at the network layer, not at the file distribution layer.