Remove internal public-launch docs and make the agent pack Claude Code-native

[Copilot]

This change trims repository content that should not be exposed in a public repo: internal/public-launch checklists, visibility planning, sprint history, and historical agent-rule notes. It also reshapes the packaged agent assets so Claude Code can consume them directly without manual renaming or relocation.

• Public repo surface cleanup

  • Removes internal/publication-planning docs that were not product or contributor-facing:
    • public readiness / visibility / release-gate docs
    • sprint reports
    • docs/project-history/**, including agent-rules
  • Cleans remaining references so the public docs no longer point at deleted internal material.

• Claude Code agent-pack format

  • Switches the managed pack layout from a custom .react-sentinel/agent-pack/ tree to Claude Code’s native .claude/ structure.
  • Replaces profile-oriented assets with directly usable Claude Code artifacts:
    • .claude/commands/*.md
    • .claude/skills/react-sentinel-debug/SKILL.md
    • .claude/agents/react-sentinel-runtime-debugger.md
  • Updates the managed manifest location accordingly.

• Installer / manifest metadata

  • Updates src/agent-pack.ts so install/update/uninstall flows target the new Claude Code-native paths.
  • Adjusts the documented managed file set to match the new asset layout.

• Public docs tightening

  • Refreshes agent-pack docs and README references to describe the Claude Code-native bundle instead of the previous custom structure.
  • Removes leftover sprint-specific wording from public-facing scenario and onboarding docs.

Example of the installed structure after this change:

.claude/
├── .react-sentinel-manifest.json
├── agents/
│   └── react-sentinel-runtime-debugger.md
├── commands/
│   ├── debug-react.md
│   ├── reproduce-bug.md
│   └── validate-fix.md
└── skills/
    └── react-sentinel-debug/
        └── SKILL.md