…rt, align bounds Addresses all blocking and should-fix findings from the aheritier review on PR #4062: [blocking #1 + #2] Generic classifier with HTTP-status precedence: - Add modelerrors.RetryableHTTPStatus(err) — catches any error carrying a retryable HTTP status (429/408/5xx) via *StatusError or message regex, without string-pattern heuristics ('connection refused' stays non-retryable). - startBackoffRetryable becomes: return err != nil && RetryableHTTPStatus(err). A StatusError{429} coexisting with context.DeadlineExceeded now arms the gate (HTTP wins), fixing the deadline-masks-rate-limit race. [blocking #3] Bounds aligned with remediation plan: - base = 15s, cap = 5min (was 1s/30s). - Additive jitter [d, 1.2d] (was equal jitter [d/2, d]), guaranteeing the full nominal wait is always respected. [blocking #4] Gate enforced only in the TryStart path: - Move gate check from startLocked into new tryStartLocked (called by TryStart/TryStartWithTimeout only). - Start() calls startLocked directly — mcpcatalog enable and skill sub-session startup are never delayed. [should-fix #5] External recovery via StartReporter: - tryStartLocked checks reporter.IsStarted() when started==false; a live reporter (e.g. after /toolset-restart) clears the gate and latches the wrapper without calling the underlying Start. - New test: TestStartableToolSet_ExternalRecoveryClearsBackoffGate. [should-fix #6] Exported constructor options for cross-package tests: - NewStartable(ts, opts...) with StartableOption, WithStartRetryJitter, WithStartRetryClock. - nowFn() clock seam; zero-value StartableToolSet still usable. [should-fix #7] Concurrent and at-boundary tests: - TestStartableToolSet_BackoffNoDoubleStartWithinWindow: 20 goroutines calling TryStart, assert underlying Start invoked exactly once. - TestStartableToolSet_BackoffAtBoundary: fake clock, gate open at expiry. [optional] Stale comment name in BackoffDormantForPlainErrors fixed. Also: - RetryableHTTPStatus test cases include plain-text regex fallback. - ExportedSetClock removed (unused; WithStartRetryClock preferred). - All gating tests converted from s.Start() to s.TryStart(). - Jitter-bounds assertions updated to [nominal, 1.2×nominal]. PR2 (#4065) will need rebasing and test updates after this lands.

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Add flag to store session when doing a cagent run #7

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