feat(basectl): show confirmed activation-registry admin activity in upgrades view

[Pulsator01]

Summary

• Adds a confirmed-only “Admin Activity” panel to the basectl upgrades view that watches safe L2 blocks and surfaces activation-registry FeatureActivated, FeatureDeactivated, and AdminChanged transactions as they land.
• Show the current safe-head activation-registry admin as Live, and seed Expected from the next scheduled upgrade when the chain config defines one.

Screenshot

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[github-actions]

Review Summary

Reviewed the addition of the confirmed-only Admin Activity panel to the basectl upgrades view. The PR adds ~937 lines of new functionality including an AdminActivityWatcher that polls safe L2 blocks for activation-registry events and surfaces them in a TUI panel.

Assessment

The code is well-structured. The previous review's findings have been addressed:

• set_timestamp now gracefully warns and returns early instead of panicking (was flagged as panic risk)
• ProcessedBlock messages are now only sent when !block_entries.is_empty() (was flagged as channel flooding)
• live_admin_client now uses Result<HttpClient, String> instead of the (Option, Option) tuple (was flagged for readability)

Architecture observations

• The watcher correctly uses MissedTickBehavior::Skip to avoid backlog on slow RPCs
• Safe-head backward regression is handled gracefully with cache reset and live-admin re-fetch
• fetch_admin_activity_for_range issues a single get_logs RPC call per range (not per-block), with local grouping by block number
• Channel capacity of 64 is reasonable given messages are now only sent for blocks with actual activity
• The AdminActivityWatcher lifecycle (start/stop/needs_restart) is clean and idempotent

No new issues found. The code is ready to merge.

[github-actions]

✅ base-std fork tests: all 616 passed

base/base is fully in sync with the base-std spec.

Dependency	Ref	Commit
base-std	main	4658f1b7
base-anvil	0092692587d8d064dd2c6923ce26a682c58f3694	00926925