3c9109c392
Extends the v0.26.0 (#28 Part 1) read-time scanner into three buckets in one pass — active link (Part 1), pending-RFC contribute offer (Part 3), create-RFC offer (Part 2) — precedence active > pending > candidate. The backend still emits only structured segments (never HTML), so the surface stays XSS-safe by construction. Part 2 — create-RFC offers: a multi-word tag from the #27 taxonomy with no defining RFC renders, for a create-rights viewer, as an inline "+ create RFC" affordance that opens the propose modal pre-filled (?propose=<term>; ProposeModal gained initialTitle). Conservative multi-word gate; broader heuristics + the Haiku path are deferred. Part 3 — contribute-to-pending offers: a term matching a super-draft renders, for a signed-in non-owner, an "ask to contribute" affordance with the owner's display name. It opens a 3-field request form (who/why/optional use-case); submitting lands a contribution_requests row (migration 024) and one actionable §15 notification per owner (new kind contribution_request_on_pending_rfc, personal-direct). The owner's inbox shows who/why/use-case inline with Accept/Decline. Accept fires #12's owner-invite flow with the requester as invitee and echoes a notification back; decline notifies the requester. Pre-merge idea PRs are out of scope. New endpoints: GET /api/rfcs/{slug}/contribution-target, POST /api/rfcs/{slug}/contribution-requests, .../{id}/accept, .../{id}/decline. The invite issue path was refactored into one reusable api_invitations.issue_invitation(...) chokepoint shared by the manual invite endpoint and Part 3's accept. Tests: 9 new (3 scanner-bucket unit + 6 e2e). Full suite 374 passing. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>