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feat(github): rate-limit-aware polling and gate-hook retry (#2119)

* feat(github): rate-limit-aware polling and gate-hook retry

Github event extension polling now parses X-RateLimit-Remaining/Reset on
every response, defers the next poll past the reset window when remaining
drops below 10 or GitHub returns 403/429, and aborts the current cycle so
additional budget is not burned against an exhausted quota. The next poll
is scheduled via a new scheduleNextPollAfter helper that takes the reset
delay into account.

pr-ready validator classifies gh CLI failures by stderr pattern. Rate-limit
errors trigger a follow-up gh api /rate_limit probe to derive retryAfterMs
and return retryable_block, so the workflow engine backs off instead of
re-running the validator on every action dispatch. Non-rate-limit failures
still hard-block.

gate-script-executor surfaces a rateLimited flag on GateScriptResult when
stderr matches the rate-limit patterns; gate-evaluator propagates it on
GateEvalResult so callers can react to GitHub budget exhaustion.

Adds shared rate-limit-detector util for stderr pattern matching and
retry-after computation, with unit tests for each layer.

* feat(github): wire rateLimited consumer end-to-end

Propagate the rateLimited signal through the full delivery path so bash
gate scripts that hit GitHub HTTP 403 no longer cause agent retry storms.

- gate-script-executor sets retryAfterMs (defaults to RATE_LIMIT_MIN_BACKOFF_MS)
  alongside the existing rateLimited flag
- gate-evaluator forwards both onto GateEvalResult
- channel-router canDeliver / deliverMessage thread rateLimited + retryAfterMs
  through GateResult and ChannelGateBlockedError
- agent-message-router result includes rateLimited + retryAfterMs on
  ChannelGateBlockedError catch
- send_message tool surfaces explicit retry guidance in error text and
  structured rateLimited / retryAfterMs fields so agents can back off
  instead of re-dispatching on the next tick

Also addresses revi... (continued)

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