feat(orchestration): retry <runId> — authored by headless pi worker (#26, #27)

Collaboration record (conductor loop, docs/plans/CONDUCTOR.md):
- round 1 (worker session worker-1, 2m28s): retry implemented per spec
- conductor live test exposed spec gap: direct invocation lacked
  launcher env exports
- round 2 (same worker session, 59s): spawnEnv made self-sufficient,
  but used PI_* where compose interpolates MOSAIC_*
- conductor hotfix: 3-line rename to MOSAIC_PROVIDER/MOSAIC_MODEL/
  MOSAIC_DATA_ROOT

Final: node scripts/mosaic-task.mjs retry <runId> re-executes a run's
task snapshot as a new run; live retry replied REMEMBERED; all suites
green (24/32/14 + verify).

Known limitation: retrying a run whose task used a RELATIVE mission path
resolves it against the temp dir; lineage tracking deferred.

Closes #25, closes #26, closes #27

BUILD-LOG.md

@@ -275,4 +275,32 @@ Adapter seam verified; harness boundary is now additive by construction. `main`
 
 M5 tagged `workspace-capabilities-v1`, M6 tagged `sessions-v1`, M7 tagged `operator-ergonomics-v1`; release 0.0.6 active. Tracker: docs/plans/2026-09-03_autonomous-run.md.
 
+---
+
+## Phase 12: Conductor loop — self-orchestration (M8)
+
+### Entry 12.1 — before
+
+- Timestamp: 2026-09-03
+- Intended action: Stand up the poor-man orchestration loop per docs/plans/CONDUCTOR.md: conductor (host, holds git) mirrors the repo into a worker workspace, dispatches a headless pi worker (session worker-1, tools read/write/edit/bash) to implement retry <runId>, reviews the diff, integrates, verifies (Gitea #25, #26, #27).
+- Reason: The owner asked for circular task processing with agent workers; the stack now has every primitive needed — this proves it on the stack itself.
+- Expected result: worker-authored retry merged with suites green and a live retry verified.
+
+### Entry 12.2 — after
+
+- Timestamp: 2026-09-03
+- Commands run: repo mirror clone; worker dispatch (tasks/worker-retry.json); diff review; apply; live retry; refinement dispatch (tasks/worker-retry-refine.json); second review; reverse+reapply combined patch; conductor interpolation fix; live retry; full sweep.
+- Observed result:
+  - Worker round 1: implemented retry correctly per spec in 2m28s; diff reviewed clean.
+  - Live retry exposed a spec gap (direct invocation lacks launcher env exports).
+  - Worker round 2 (same session, 59s): made spawnEnv self-sufficient, but used PI_* names where compose interpolates MOSAIC_*.
+  - Conductor hotfix: 3-line rename to MOSAIC_PROVIDER/MOSAIC_MODEL/MOSAIC_DATA_ROOT (too trivial for a worker round).
+  - Final: live retry succeeded (replied REMEMBERED, new run recorded); all suites green.
+- Failure or correction: three rounds total — one spec gap (conductor), one naming mismatch (worker), one trivial rename (conductor). Each was caught by mechanical verification (run record stderr), never by hope.
+- Attribution: feature authored by headless pi worker (glm-5.3-flash) in sessions worker-1; conductor reviewed, integrated, and hotfixed.
+
+## Result (M8)
+
+Conductor loop proven end-to-end on the stack itself. `main` merged with M8; release 0.0.6 remains active (retry is host-side only, no image change).
+