feat(orchestrator): reconcile closed issue statuses

[corylanou]

Summary

• Add an orchestrator tick reconciliation pass for CLOSED/completed issues in non-terminal project statuses.
• Hydrate GitHub close reasons through ProjectV2 GraphQL issue nodes and REST issue refreshes.
• Emit a log line plus snapshot event when reconciliation succeeds and prevent closed items from dispatching.

Fixes #321

Test Plan

• go test ./internal/orchestrator
• go test ./internal/connector/github
• make check

[corylanou]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

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