refactor(#100): remove outdated opencode-ntfy references and install …

…script (#101)

feat: document model selection for pilot sessions

Add tests and documentation for the model config option that allows
overriding the agent's default model per-source or globally via defaults.
The implementation plumbing already existed - this adds test coverage
(8 new tests) and user-facing documentation.

Closes #99

feat(dedup): prevent duplicate sessions for linked issues and PRs

Cross-source deduplication detects when a Linear issue and GitHub PR
represent the same work by extracting issue references from PR title/body.

fix(brew): add PATH to service environment for gh CLI access

docs: update AGENTS.md for Homebrew installation

fix(ci): enable git credentials for formula push

refactor(ci): use semantic-release exec plugin for brew formula updates

Replaces separate CI job with @semantic-release/exec successCmd.
Formula is updated after GitHub release creates the tarball.

feat: add Homebrew formula for service management

- Add Formula/opencode-pilot.rb with brew services support
- Simplify semantic-release (no version commit back to repo)
- Users can now: brew tap athal7/opencode-pilot && brew install opencode-pilot

chore(release): 0.20.5 [skip ci]

## [0.20.5](v0.20.4...v0.20.5) (2026-02-05)

### Bug Fixes

* **worktree:** reuse stored directory when reprocessing items ([1a8909e](1a8909e))

chore(release): 0.20.4 [skip ci]

## [0.20.4](v0.20.3...v0.20.4) (2026-02-05)

### Bug Fixes

* **readiness:** handle attention-based PR filtering with bot-only comments ([fae0a3b](fae0a3b))