Two SHOULD-FIX items from the Opus advisor pass on PR #1675:
1. **PATCH/DELETE handler routing asymmetry**. The /boards/<slug> path
match was running AFTER ?board= resolution, so a stray ?board=ghost
on a 'PATCH /api/kanban/boards/experiments?board=ghost' would 404 on
the missing 'ghost' board instead of editing 'experiments'. POST
already routed /boards first; PATCH/DELETE now mirror that structure.
The ?board= query is still resolved for the task-scoped routes that
actually need it.
2. **SSE event frames now emit 'id: <event_id>' lines**. EventSource
stores Last-Event-ID and sends it on auto-reconnect; without an 'id:'
field on each frame the browser couldn't resume cleanly across
connection drops, forcing the server to re-stream up to
_KANBAN_SSE_BATCH_LIMIT=200 events the client already had. The
handler now (a) emits 'id: <cursor>' on every events frame, and
(b) reads Last-Event-ID from the request headers as a fallback when
?since= is absent.
+4 regression tests:
- test_handle_kanban_patch_routes_boards_slug_before_board_query_param
- test_handle_kanban_delete_routes_boards_slug_before_board_query_param
- test_sse_emits_id_lines_so_browser_can_resume_via_last_event_id
- test_sse_honours_last_event_id_header_when_since_absent
Total kanban tests: 67 -> 68 (CSS-injection fix in 60874db) -> 72 (this).
Co-authored-by: ai-ag2026 <ai-ag2026@users.noreply.github.com>
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