feat(tour): multi-project parallel fan-out — one runner per repo

Two or more project paths dispatch one general-purpose runner per repo,
all in a single message, instead of processing repos one by one. The
runner inherits the session model — no pin, it carries tour's reflection
(fix decisions, convergence) — and every agent inside keeps its defined
tier (security-auditor sonnet, Phase B opus, doc-syncer sonnet). A dead
or mute runner becomes an explicit RUNNER FAILED summary row; the gated
capitalize offer stays in the main loop, never in a runner.

Bounded LRN-083 derogation recorded in BDR-084: the per-project fix loop
moves into its runner, but nothing a runner decides touches shared state
— independent repos, per-repo chore branches, branches left unmerged for
human review exactly as inline. Mechanics proven before building: nested
probe, 3 sub-agent windows all overlapping, 9.1s vs ~18s sequential.

Census §12: 6 locks, flip-tested. Single-project path unchanged.

.claude/memory/journal.md

@@ -439,3 +439,4 @@ rules:
 - Shipped Palier 2 (user-chosen): lib/gates.sh + GATE 0 + oracle-bearing criteria + `ABANDONED(n)` verdict + 4-pass executors. Refused unlazy's Stop hook, approval store, .unlazy/ tree, tree-N arithmetic, Node checker — [[BDR-083]] records each why.
 - `make test` rc 0, shellcheck clean, 64 new assertions, e2e on a real contract. Branch feature/contract-gates UNMERGED (human gate).
 - Locks caught a reflow regression (5 red on rewrapped phrases, zero doctrine lost) → [[LRN-142]]. Skill-adoption pattern → [[LRN-141]].
+- Parallelism audit (user ask "est-ce actif ?"): measured, not assumed — nested probe proves concurrent fan-out (9.1s vs 18s), doctrine already prescribed everywhere safe, remaining serializations motivated. One candidate found: /tour multi-project → parallel runners shipped ([[BDR-084]], user gate "tout paralléliser" + model invariant). Branch feature/tour-parallel UNMERGED.