feat: rebuild the shipped AGENTS.md and preset skills

[Tanq16]

Replaces the AGENTS.md content ClaudeX ships, splits it by whether a rule is portable or personal, trims the base skill set, and rebuilds the preset's skills as single-subject skills.

AGENTS.md

• internal/embedded/agents/AGENTS.base.md carries Prose/Output Principles only, so every claudex apply gets the portable half.
• The development preset is renamed private, and its AGENTS.partial.md carries Development Principles, Pull Request Principles, and Operating Principles.
• Operating Principles moved out of the base because it states host facts ($HOME/shell/extensions/, the uv and fnm environment variables) that are true on one machine only.
• Prose/Output Principles gains a rule against progress narration, covering openers, bridges between steps, and step closers.

Skills

• cross-ai is removed. The base set is skill-creator and session-summary.
• The preset's 13 skills and 32 reference files become 30 skills and 6 reference files, all six under review-code where a sub-agent is handed the path directly. Set size drops from ~426,000 to ~292,000 characters, and the floor cost of any Go task halves.
• go-foundations, go-cli, go-backend, go-frontend, go-concurrency, node-foundations, node-backend, and project-ci-cd are split by subject. dockerize is new and language-agnostic, covering multi-stage builds, base image choice, runtime packaging, cache clearing, and a non-root user.
• develop's Skill Map and review-code's six domains are re-cut to the new set.
• Every body is under the 4,500-token budget; the largest is go-oauth-cli at ~3,420.

Standardizations applied across the set

• Releases trigger on push to main. The version is computed by the Makefile and the workflow calls make -s version, so CI and a laptop produce the same number. Tag-push triggering is documented nowhere.
• Assets are never committed. make downloads them and CI calls the same target.
• Every dependency and action is version-pinned to a tag that was checked against the upstream releases, never floating and never commit-pinned.
• Terminal colors are ANSI indexed, never hex, so tooling follows the user's terminal theme.
• Web fonts are woff2 only. Inter, Google Sans, and JetBrains Mono Nerd Font Mono are always downloaded; the Nerd Font is converted from ttf by a recipe both Makefiles share.
• The review domain files lose their "Expected Pattern" column. review-code now states the rule that replaces it: the expected pattern lives in the skill the domain names, and a finding cites the skill section it comes from.

Nuances

• chrome-extension-basics is renamed chrome-extension, and go-dockerfile never lands because its material went to dockerize.
• go-embedded-frontend moves to Tailwind v4. The v3 CDN is frozen and the v4 browser build throws on a JS config, so the old tailwind.config global produced no CSS.
• Section order in an assembled AGENTS.md is Prose/Output, then Development, Pull Request, Operating.
• The preset name is the marker name, so a project that already applied development keeps a <!-- claudex:preset:development --> block.
• Flavors are removed entirely: the internal/flavors package, the --flavor and --no-flavor launch flags, the launch-time picker, and the ~/.config/claudex/flavors directory configure used to create. An existing flavors directory is left on disk untouched.
• skills_gate_test.go and utils/paths_test.go are removed. internal/workspace keeps the only test file, covering the AGENTS.md marker states and the git exclude anchoring.
• The README is rewritten to the shipped prose principles.
• .github/workflows/notifications.yaml is deleted. release.yaml is the only workflow left.

🤖 Generated with Claude Code