feat(cli): make appa own Claude Code initialization

[arsenyinfo]

Summary

• ship one versioned appa package and executable; the daemon is now the internal appa runtime subcommand rather than a second appa-runtime binary
• add appa init claude-code as the single owner of Claude Code setup: discover the matching adapter, replace existing APPA registrations, preserve policy and custom statusline state, install one user-scoped plugin, start the daemon, and verify its binary fingerprint
• migrate a running legacy appa-runtime deployment by exact executable path, then remove the retired binary instead of stacking old and new runtimes
• keep appa describe as the lean text view of the current configuration world and make appa-guide inspect it before proposing policy
• give shipped APPA crates, the Python binding, and the Claude plugin the shared 0.5.0 release version; release automation now owns the Cargo workspace version and lockfile
• render a compact, TTY-colored init receipt with current checkout, ~ paths, and clappa; statusline and daemon paths stay implementation details
• package the Claude adapter, batteries, and contract guide with release artifacts so a checkout or archive can be tested end to end

End-to-end flow

cargo install --path appa-runtime --force
appa init claude-code
clappa

Then run /appa-guide init in Claude Code. Re-running appa init claude-code replaces the APPA deployment instead of stacking another plugin/runtime.

Validation

• cargo test -p appa (full suite)
• cargo check --workspace --locked
• isolated cargo install --path appa-runtime --locked --offline proves Cargo installs appa v0.5.0 with exactly one executable, appa
• appa --version and appa runtime --version both report 0.5.0
• init integration tests cover idempotence, legacy-binary cleanup, custom statusline preservation, and wrong-runtime fingerprint refusal
• isolated Claude plugin-manager add/install/uninstall/reinstall exercise, including same-version local source replacement
• uv lock --check --directory appa-agent-python
• cargo fmt --all -- --check
• git diff --check
• claude plugin validate integrations/claude-code
• POSIX hook sh -n and shellcheck
• release workflow actionlint
• appa-guide behavioral review passed