issue-watch: multiplier-aware new-issue monitoring for miners (gittensory_watch_issues)

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Goal: alert a miner to a fresh, high-fit, high-multiplier issue the moment it opens — maintainer-created issues carry the biggest multiplier and it's a race (first credible PR wins).

Scope: new-issue detection on registered repos (issues webhook + registry sync); classify by MULTIPLIER tier (maintainer-created/labeled vs community), open/unclaimed status, and FIT (reuse buildContributorOpportunities). Miner subscription model (repo set / label / min-multiplier / min-fit), self-scoped (requireContributorAccess). Delivery via the #535 notifications service (no parallel path). MCP: gittensory_watch_issues (configure) + new opportunities surfaced in get_decision_pack / a pull tool.

Acceptance: a new maintainer-created issue on a watched repo yields a ranked, multiplier-tagged, fit-scored, claimed/duplicate-filtered alert (public-safe, no reward $); self-scoped.

Depends on: #535 (delivery), #536 (event plumbing). Effort: L. Sub-issue of #527.

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Inherits #525 cross-cutting AC: test:ci + 97% coverage; miner⊕maintainer access boundary (identity per-login, authority per-repo) + public-safe redaction (#542); advisory-first, no auto-merge/submit; no source upload from miner tooling. Part of #525.

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Design dependency — #186: ranking must distinguish a maintainer-created issue that is open/unassigned/labeled-for-contribution (prime high-multiplier target) from one that is self-assigned/WIP/not-for-outsiders (should NOT be surfaced as available). Reuse/extend the #186 fix (downgrade-by-intent in buildIssueQualityReport) so issue-watch and the quality report share one signal.

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Path A (the pull surface) shipped in #706 (merged 21bb0f3b).

What landed:

• ContributorOpportunity now carries multiplierTier (maintainer_created | community) and availability (ready | maintainer_wip).
• buildContributorOpportunities ranks grabbable maintainer-created issues above equivalent community issues (biggest Gittensor reward multiplier) and heavily downgrades a maintainer's own WIP/internal issues.
• buildIssueQualityReport now reads authorAssociation (this also closed [Bug]: Maintainer-authored issues can be scored ready for outside contributors #186): maintainer-authored issues get a confirm-scope warning; maintainer-WIP issues can never read ready.
• Flows through the existing decision-pack + gittensory_get_decision_pack MCP surface automatically.

Remaining for this issue (path B — the active monitor):

• gittensory_watch_issues MCP tool + the watch registration surface (a miner subscribes to repos/labels and is notified on new grabbable high-multiplier issues, not just on-demand ranking).
• Delivery via the feat(notifications): event-to-subscription-to-delivery service #535 notification pipeline (push the new-issue alert).
• Optional: a freshness/"first-mover" signal so a miner can act before the issue is widely seen.

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Verified shipped via #735 (path B) + #742/#747/#706 (2026-06-17 triage). gittensory_watch_issues MCP tool (mcp/server.ts:876-883,1611), IssueWatchSubscription (types.ts:1131), self-scoped subscriptions, detectIssueWatchEvents fan-out (processors.ts:85,762), migration 0036, multiplier-aware ranking (#706), case-insensitive matching (#747). Closing.