## Ticket 023: Confirm session-layer architecture can accommodate both audit logging and observability hooks without performance degradation

**Sources:** concern from Dormouse on observability preconditions for session layer
**Owner:** Cheshire Cat
**Tier:** v1
**Estimate:** 1 day, 75% confident
**Status:** open

**Dependencies:**
- Blocks: implement-minimal-session-audit-layer-for-incident-response-visibility
- Blocked by: specify-session-audit-log-format-for-breach-investigation-and-gdpr-compliance, specify-session-telemetry-observability-hooks-required-for-production-incident-response
- Soft: —

**Description:**

The Cat must confirm that ADR-002 (minimal session audit layer) can accommodate (a) synchronous audit logging for every request (Queen's requirement), (b) real-time observability telemetry collection (Dormouse's requirement), and (c) session token generation/validation (Tweedles' requirement) without blocking performance or creating observability blind spots. If synchronous logging will cause p99 latency spikes, the Cat must name that tradeoff and propose alternatives (async logging, batch audit writes, sampling). This confirmation gates the Tweedles' implementation spec.

**Acceptance:**
- Cat has confirmed (or refuted) that ADR-002 can accommodate both audit logging and observability without performance cost
- If tradeoffs exist (e.g., 'async audit logging has 5-second delay'), they are named explicitly and the Queen/Dormouse have accepted them
- The Cat has specified the implementation sequence (token generation first, audit hooks second, observability instrumentation third) to avoid blocking on architectural ambiguity

**Risk:**

If the Cat does not confirm until after the Tweedles start implementing, the Tweedles will be mid-implementation when architectural constraints surface. Confirm the architecture before implementation begins.
