[DECOMPOSITION] Telegram adapter send/poll circuit breaker

[Lexus2016]

Parent issue\n#524 — Telegram Gateway Unreliable\n\n## This slice\nUse the shared utility in the Telegram adapter () to add a session-scoped circuit breaker around send and poll operations. After N consecutive failures, Telegram is marked unhealthy for a configurable cooldown T seconds, preventing retry loops and cascading log spam.\n\n## Acceptance criteria\n- [ ] integrated into Telegram adapter.\n- [ ] Configurable N and T via config.yaml under .\n- [ ] Cooldown respected by both polling and send paths.\n- [ ] Health state exposed for introspection.\n- [ ] Regression tests with mocked .\n\n## Estimated effort\nMedium (< 2 days)\n\n## Linked parent\nChild of #524.

[Da-Mikey]

Implementation PR created on the Da-Mikey fork: Da-Mikey#4

_FailureCounter wired into TelegramAdapter: send() and polling paths. Defaults: 3 failures, 30s cooldown. 31-line change, no formatting noise.

[Da-Mikey]

New PR: Da-Mikey#8 (clean cherry-pick, supersedes old PR #4)

[Da-Mikey]

Implementation status: blocked

On the Da-Mikey fork, the implementation exists as PR #8 but cannot be rebased yet.

Root cause: PR #8 depends on the _FailureCounter class in agent/retry_utils.py, introduced by issue #571. That class is part of upstream PR #574 (owner-authored, all CI green) which has not yet merged into main. Additionally, PR #8 conceptually depends on PR #7 since both use the same failure-tracking pattern.

What needs to happen:

1. PR feat: web search fallback chain + loop-guard rework (Closes #467 #544 #571) #574 merges (bringing _FailureCounter to main)
2. Da-Mikey fork main syncs from upstream
3. PR chore(sync): merge upstream/main (60 commits) into fork #8 rebases cleanly on the updated main

After PR #574 lands, this should be a trivial rebase — the code is written and tested. No new implementation needed.

[Lexus2016]

Rejected by evolution-analysis: blocked — external implementation PR exists on contributor fork and is blocked pending upstream PR #574 merge; not actionable in this cycle.