v2.0.0-beta.2 — B-RRH recovery hardening (interim 5-ticket ship)

Interim prerelease of the 5 completed B-RRH Runtime Recovery & Resilience Hardening tickets on top of v2.0.0-beta.1:

• A0 event taxonomy — 6 net-new activity events (ca69db90)
• A status/scope/phase/rate-limit-aware progress accounting (33a9c08a)
• C1/C2 gate pickle-phase completion on all-tickets-Done, not mux exit code (cb23c3fc)
• C3 never Failed-flip a committed ticket on signal teardown (c5eb1eef)
• C4 guard every HEAD-reset path with is-ancestor ff-reattach (acaef709)

Full release gate green at c=4 (tsc / eslint / 8 audits / JS↔TS parity / test:fast / test:integration / test:expensive). Sole expensive-tier failure is the documented codegraph serve --mcp handshake concurrency flake (green isolated; = bundle ticket E9a).

Remaining 16 B-RRH tickets (rate-limit park, CPU watchdog, dirty-tree quarantine, state idempotency, gate-scope) resume on this deployed runtime.

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