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>

scripts/install.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+# shellcheck source=deploy-manifest.sh
+source "$REPO_ROOT/scripts/deploy-manifest.sh"
+
+echo "Installing from $REPO_ROOT..."
+
+for entry in "${DEPLOY_FILES[@]}"; do
+  dest="$HOME/${entry##*:}"
+  mkdir -p "$(dirname "$dest")"
+  cp "$REPO_ROOT/${entry%%:*}" "$dest"
+done
+
+for entry in "${DEPLOY_EXECUTABLES[@]}"; do
+  dest="$HOME/${entry##*:}"
+  mkdir -p "$(dirname "$dest")"
+  cp "$REPO_ROOT/${entry%%:*}" "$dest"
+  chmod +x "$dest"
+done
+
+for entry in "${DEPLOY_DIRS[@]}"; do
+  dest="$HOME/${entry##*:}"
+  rm -rf "$dest"
+  mkdir -p "$dest"
+  cp -r "$REPO_ROOT/${entry%%:*}/." "$dest/"
+done
+
+for dir in "${DEPLOY_EMPTY_DIRS[@]}"; do
+  mkdir -p "$HOME/$dir"
+done
+
+echo ""
+echo "Deployed:"
+for entry in "${DEPLOY_FILES[@]}" "${DEPLOY_EXECUTABLES[@]}"; do
+  echo "  ~/${entry##*:}"
+done
+for entry in "${DEPLOY_DIRS[@]}"; do
+  echo "  ~/${entry##*:}/"
+done
+for dir in "${DEPLOY_EMPTY_DIRS[@]}"; do
+  echo "  ~/$dir/ (directory created)"
+done