# Harbormaster v10.0.0a4 — Sprint Retro

**Phase 4 of 8** in the v10.0 alpha chain.

## Shipped

**Top-level `[ignore].patterns` config section + sidebar indicator.**

Operators can now hide projects from discovery via fnmatch globs
without touching `[projects].exclude` (which uses gitignore-style
component-name matching). The new section is glob-matched against
basename, full path, and `**/segment/**` component shortcuts.

## Implementation

`config.py`:
- New `IgnoreConfig(patterns: list[str] = [])` Pydantic model with
  `extra=forbid`.
- Wired onto `HarbormasterConfig.ignore` (default factory = empty).

`projects.py`:
- New `_matches_ignore_patterns()` helper.
- `discover_projects`, `find_project_path`, and the public
  `resolve_project` alias gained an optional `ignore_patterns` kwarg.
  Default `None` preserves the v9 contract (so any third-party
  caller using these functions doesn't break).

Call-site updates (8 sites): `ui/routes.py`, `tools/_helpers.py`,
`tools/fan_out.py`, `tools/graph.py`, `tools/projects.py` — every
existing `discover_projects(config.projects)` and
`resolve_project(name, config.projects)` now passes
`ignore_patterns=config.ignore.patterns`.

`ui/routes.py`:
- New `GET /api/ignored-projects` returns
  `{patterns, count, names}`. The `names` list is computed as
  `(all - visible)` — i.e. running discovery twice (once with
  empty ignore, once with live patterns) and diffing. O(2 *
  discovery cost), acceptable since the sidebar fetches lazily on
  mount.

`templates/base.html`:
- New collapsed "Ignored" section under the existing groups.
- Read-only — operators edit the list in TOML; the sidebar just
  surfaces what's currently hidden so changes are visible without
  having to mentally re-run the glob.
- Lazy fetch in `_loadIgnored()` runs alongside the existing
  `_loadProjects` / `_loadRecent` parallel-init.

## Tests

`tests/unit/test_ignore_patterns.py` (13 tests):
- `IgnoreConfig` defaults + extra-forbid validation.
- Helper match shapes (basename, full path, `**/segment/**`,
  no-match, empty short-circuit).
- `discover_projects` integration: no-ignore returns all, basename
  glob, double-star segment.
- `find_project_path` raises on hidden names.
- Backward-compat: omitting `ignore_patterns` reproduces v9
  behaviour.

`tests/ui/test_ignored_projects_endpoint.py` (4 tests):
- Endpoint returns zero when no patterns.
- Endpoint lists filtered project names.
- Endpoint excludes visible projects from `names`.
- Sidebar markup contract (group id, Alpine state, loader, endpoint
  reference).

## Numbers

- Tests: 1034 → 1051 (+17).
- Source files: 52 → 52 (no new modules; IgnoreConfig added to
  existing config.py, helper added to existing projects.py).
- mypy --strict: clean.
- ruff: clean.

## Deviations

None. Implemented as specced.

## Risks / Follow-ups

- The `/api/ignored-projects` endpoint runs discovery twice. If that
  becomes a hot path (it's not today — sidebar lazy-loads it once
  per page) we'll cache the diff in `manifest_cache.py`.
- Two ignore mechanisms (`[projects].exclude` for component names,
  `[ignore].patterns` for globs) is a small DX wart but justified
  by the operator decision to keep them distinct (different match
  semantics, different mental model). Document in the eventual
  v10 GA migration notes.
- Sidebar hides the Ignored section entirely when count is 0 — no
  visual noise on installs without ignore patterns.
