Add release-based installation (install without cloning)

[Jason-Adam]

Summary

Currently, installing autodidact requires cloning the repo, running uv sync, and executing ./install. This ties users to maintaining a local source tree and creates friction for adoption. We should support installing from a GitHub release so users can run a one-liner without cloning.

Goal

A user should be able to install a specific version of autodidact with something like:

curl -sSL https://github.com/Jason-Adam/autodidact/releases/latest/download/install.sh | bash
# or
curl -sSL ... | bash -s -- v0.2.0  # specific version

Current State

• install.py creates symlinks from the cloned repo into ~/.claude/ — this requires the source tree to stay in place
• pyproject.toml already uses hatchling as the build backend
• CI runs tests but has no release workflow
• No GitHub releases exist yet

Proposed Approach

1. Release Workflow (.github/workflows/release.yml)

• Trigger on version tags (v*)
• Run the test suite
• Package a self-contained release tarball containing src/, skills/, agents/, commands/, templates/, hooks/, and the installer
• Create a GitHub release with the tarball attached
• Optionally publish to PyPI

2. Standalone Installer

• A bootstrap script (e.g., install.sh) that:
  • Downloads and extracts the release tarball to ~/.claude/autodidact/
  • Copies files instead of symlinking (no source tree dependency)
  • Patches ~/.claude/settings.json with hooks (same as current install.py)
  • Initializes the learning DB
  • Supports --version flag to pin a specific release
  • Supports --uninstall to remove everything

3. Update Mechanism

• install.sh --update to pull the latest release and re-install
• Version marker at ~/.claude/autodidact/.installed already exists — extend it to track installed version

4. Versioning

• Adopt tag-based versioning (v0.1.0, v0.2.0, etc.)
• Consider a changelog (manual or automated)

Out of Scope (for now)

• Homebrew formula
• Platform-specific installers (.deb, .rpm)
• Auto-update daemon

Acceptance Criteria

• Tag-triggered release workflow creates GitHub releases with a tarball
• A standalone install script can install autodidact from a release without cloning
• --version flag allows installing a specific release
• --uninstall removes the installation cleanly
• Existing clone-based ./install workflow continues to work
• README documents both installation methods