Add transition notification publication substrate

[efraespada]

Adds a reusable, idempotent transition-notification publication path with strict identity, fingerprint, content, and target validation. It records bounded, content-free outcomes for localized Job Summary reporting and strengthens coverage for duplicate handling and invalid targets.

What changed

• Added immutable transition markers and fingerprints derived from trusted transition identity and source data, excluding visible message content.
• Added reconciliation that creates one bot-owned notification per fingerprint, detects concurrent creation, removes or compacts duplicates, and preserves issued copy.
• Added validation for publication target kinds and numbers, notification length, link count, HTML markers, bot identity, and malformed markers.
• Added localized action-summary reporting for created and reused notifications, plus updated architecture/specification metadata and generated bundles.
• Added focused tests covering creation, reuse, duplicate cleanup, visibility lag, forged markers, invalid content, provider failures, and target validation.

Review notes

• This PR adds the shared notification substrate and does not migrate a feature to use it; branch-sync adoption remains a separate rollout step.

[docs-page]

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docs.page/vypdev/copilot~386

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.98%. Comparing base (274db40) to head (97f6a12).
⚠️ Report is 768 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #386      +/-   ##
===========================================
+ Coverage    90.94%   92.98%   +2.03%     
===========================================
  Files          135      656     +521     
  Lines         6251    17411   +11160     
  Branches      1338     4471    +3133     
===========================================
+ Hits          5685    16189   +10504     
- Misses         172      473     +301     
- Partials       394      749     +355     

Files with missing lines	Coverage Δ
...ication/policies/action_summary_message_catalog.ts	100.00% <ø> (ø)
src/application/policies/action_summary_policy.ts	97.02% <100.00%> (ø)
...pplication/policies/publication_identity_policy.ts	100.00% <100.00%> (ø)
...application/policies/publication_outcome_policy.ts	100.00% <100.00%> (ø)
...s/steps/common/transition_notification_workflow.ts	100.00% <100.00%> (ø)
src/domain/github_publication.ts	100.00% <100.00%> (ø)

... and 712 files with indirect coverage changes

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[vypbot]

Current status: All findings originating in this review are resolved.
Last reconciled on 97f6a12. See aggregate Bugbot status.

🤖 Bugbot review snapshot

Bugbot reported 1 potential problem when commit 8793745 was analyzed. This snapshot is historical; use the status block above for current state. 1 finding is linked to changed code.

Findings

• low: Failed results can be reported as published notifications — src/application/policies/publication_outcome_policy.ts:120

[vypbot]

Bugbot: review complete

Current status: No active findings on 97f6a12.

Pull request · Verified commit · Workflow run

[vypbot]

Current status: All findings originating in this review are resolved.
Last reconciled on 97f6a12. See aggregate Bugbot status.

🤖 Bugbot review snapshot

Bugbot reported 1 potential problem when commit 87b876b was analyzed. This snapshot is historical; use the status block above for current state. 1 finding is linked to changed code.

Findings

• low: Invalid transition targets can create unreconcilable notifications — src/application/policies/publication_identity_policy.ts:111