chore(plan-marshall): enable orchestrator auto_emit and set parallelization_scope

[cuioss-oliver]

What

Records the two orchestrator autonomy knobs the api-sheriff-roadmap epic now runs under, set by operator decision on 2026-07-28/29.

   "orchestrator": {
-    "auto_emit": false
+    "auto_emit": true,
+    "parallelization_scope": 2
   },

Why

auto_emit: true — on every landing that frees a slot, the orchestrator auto-fills toward parallelization_scope and auto-stamps the launched transition, rather than waiting for a per-plan operator confirmation. What it does not change: the disjointness guard, the prep-readiness guard, the N − R slot count, and the emit≠running invariant — the launched → running start stays operator-owned under either value, and a colliding or unprepared plan is never emitted just to fill a slot.

parallelization_scope: 2 — previously unset at the config default. The epic already carried 2 at the epic level (the value the next verb actually reads), so this changes no current behaviour; it makes the standing "always aim for two parallel plans" instruction durable rather than epic-local.

The knobs have been live for two plans already. PLAN-07B and PLAN-32 ran concurrently under them and produced zero rebase conflicts, and the post-landing auto-fill correctly skipped two blocked candidates to emit PLAN-31A.

Scope

Configuration only. No production code, no tests, no build behaviour. The file was modified in the working tree while PLAN-07B was in flight and is landed here as its own change rather than folded into an unrelated plan's PR.

Review

Labelled skip-bot-review per operator instruction — a two-line config change with no reviewable surface.

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