session-memory Phase 0: end-to-end verification + docs (T07)

- verified full sweep over 85 real local Claude transcripts: 63 sessions
  ingested+analyzed, eviction under tiny cap freed 26MB with zero data loss,
  digest-preservation invariant holds, idempotent re-run
- session_memory/README.md: usage, scheduling, retention knobs
- design doc: OQ4 resolved (median ~49KB/session), OQ6 (multi-file sessions)
- workplan AGENTIC-WP-0002 finished

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

workplans/AGENTIC-WP-0002-session-memory-phase0.md

@@ -4,7 +4,7 @@ type: workplan
 title: "Coding Session Memory — Phase 0 (Capture + budget-based retention)"
 domain: helix_forge
 repo: agentic-resources
-status: active
+status: finished
 owner: codex
 topic_slug: helix-forge
 created: "2026-06-06"
@@ -118,7 +118,7 @@ intended `cadence` trigger (`/schedule` daily/weekly) in the repo docs.
 
 ```task
 id: AGENTIC-WP-0002-T07
-status: progress
+status: done
 priority: medium
 state_hub_task_id: "98d5cc7c-c285-4556-91a3-a85e0a2bb6df"
 ```
@@ -133,3 +133,11 @@ sizes). After workplan file updates, notify the custodian operator to run from
 ```bash
 make fix-consistency REPO=agentic-resources
 ```
+
+**Verification results (2026-06-06):** full suite 26/26 green. Live sweep over 85
+real local Claude transcripts → 84 parsed (1 empty, tolerated) → 63 distinct
+sessions ingested + analyzed. Eviction under a 2 MB soft cap freed 26 MB, ended at
+1.34 MB (under cap), zero data loss, and every evicted session kept its Tier 2
+digest (invariant holds). Idempotent re-run skipped 84 unchanged, re-ingested 1
+(the live session). Outcomes 52 success / 11 abandoned. OQ4 sizes recorded in the
+design doc; OQ6 (multi-file sessions) noted as a Phase-1 refinement.