docs: sync implementation status to v2.6.64

[LucasSantana-Dev]

Summary

Housekeeping for the docs after v2.6.64 shipped.

• Bump `IMPLEMENTATION_STATUS.md` header to v2.6.64.
• Split the single `/digest` entry into view / schedule / unschedule so the shipped scheduler (v2.6.64) is visible alongside the v2.6.24 view entry, and note the v2.6.64 view accuracy fix (getCasesSince + composite index).
• Drop "Scheduled mod digest" from Known Gaps — shipped in feat(bot): scheduled weekly mod digest #497 / chore(release): v2.6.64 #499.
• Archive `.agents/plans/lastfm-improvements-2026-03-30.md` now that all three phases (duration fix, normalizers, top-tracks seeds) shipped in e1b4af3 and stabilized through v2.6.61.

The only item left in Known Gaps is `/playlist collaborative` (L, explicitly deferred).

Test plan

• No code changes; doc-only
• Quality Gates / Security / SonarCloud pass

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Project	Deployment	Actions	Updated (UTC)
lucky	Ready	Preview, Comment	Apr 7, 2026 10:48pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1d116528-5ce6-4d72-a85d-30e395a1b914

📥 Commits

Reviewing files that changed from the base of the PR and between 0098c74 and b4163a3.

📒 Files selected for processing (2)

• .agents/plans/archive/lastfm-improvements-2026-03-30.md
• docs/IMPLEMENTATION_STATUS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/status-v2.6.64

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud