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Adds a small JSONB KV map to every issue for agent pipeline state (attempts,
PR number, pipeline status, ...). Keys match a narrow regex, values are
primitives (string / number / bool), capped at 50 keys per issue and 8KB
per blob. Defense-in-depth via two CHECK constraints (object shape + size).
All mutations are single-key atomic (jsonb_set / `- key`). `UpdateIssue`
intentionally does NOT touch metadata: a whole-blob overwrite would race
with concurrent agent writes.
GET /api/issues/:id/metadata
PUT /api/issues/:id/metadata/:key body: { "value": <primitive> }
DELETE /api/issues/:id/metadata/:key
Containment filter on list: GET /api/issues?metadata=<json-object> uses
PG `@>` against a `jsonb_path_ops` GIN index. Mirrored across ListIssues,
CountIssues, ListOpenIssues, and the hand-rolled ListGroupedIssues SQL so
CLI/API and UI grouped views stay consistent.
CLI: multica issue metadata {list,get,set,delete}
multica issue list --metadata key=value (repeatable, AND)
set has --type to override the default value-sniffing
Co-authored-by: multica-agent <github@multica.ai>