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/0005-coding-instructions.md

@@ -0,0 +1,18 @@
+# 0005 — Write core/instructions/coding.md ✅
+
+## What to build
+
+Create the coding conventions instruction file at `core/instructions/coding.md`. Plain markdown, no frontmatter. The agent reads this file on demand when writing, editing, or reviewing code, as directed by the content index in `providers/claude-code/CLAUDE.md`.
+
+The file establishes five key rules: automate anything repeatable; no comments unless the why is genuinely non-obvious; no defensive code at internal boundaries; prefer explicit over implicit; no abstractions, features, or cleanup beyond what the task requires.
+
+## Acceptance criteria
+
+- [ ] File exists at `core/instructions/coding.md`
+- [ ] Contains all five rules from the PRD Module 2 section
+- [ ] Plain markdown with no frontmatter or schema
+- [ ] In a new session, ask the agent to implement something with unnecessary complexity — agent pushes back and names the rule being violated
+
+## Blocked by
+
+- 0004 — rewrite providers/claude-code/CLAUDE.md and retire global.md