enhance(#4570): allow disabling planner stall detection (#4585)

* enhance(#4570): allow disabling planner stall detection

* docs(#4570): add changelog fragment

Emitted-Drift-Ack-Growth: plan-phase.md — the explicit opt-out gate covers all five planner and checker spawn classes
Emitted-Drift-Ack-Growth: settings-advanced.md — the toggle prompt and bounded-recovery warning expose the new setting

* chore(#4570): refresh compact-content baseline

* fix(#4570): preserve default-on watchdog fallback

* docs(#4570): qualify the chunked-mode orchestrator rules with the toggle

The two chunked-planning-mode stall-watch imperatives read as
unconditional, with the opt-out stated only in a following bullet. State
the PLANNER_STALL_DETECTION_ENABLED condition inline, matching the three
sites already qualified in plan-phase.md.

* chore(#4570): refresh compact-content baselines against rebased next

* fix(#4570): sync planner stall launcher

Keep the stall-detection helper aligned with the canonical runtime launcher.

* chore(#4570): refresh compact baseline after rebase

---------

Co-authored-by: Tom Boucher <trekkie@nomorestars.com>

gsd-core/workflows/plan-phase.md

@@ -941,6 +941,9 @@ Every task MUST include these fields — they are NOT optional:
 
 **If `CHUNKED_MODE` is `false` (default):** Spawn the planner as a single long-lived Agent:
 
+**Dispatch/wait gate — `PLANNER_STALL_DETECTION_ENABLED`:**
+- **`true` (default):** use `run_in_background=true` in the Agent() call shown below, then use `gsd_stall_watch` as specified after it.
+
 ```text
 Agent(
   prompt=filled_prompt,
@@ -951,7 +954,9 @@ Agent(
 )
 ```
 
-**ORCHESTRATOR RULE — ALL RUNTIMES:** `TS=$(date +%s)`; repeat `PLANNER_STALL_RESULT=$(gsd_stall_watch "$TS" "{outputFile}" "${PHASE_DIR}"'/*-PLAN.md' "## PLANNING COMPLETE" "## PHASE SPLIT RECOMMENDED" "## ⚠ Source Audit" "## CHECKPOINT REACHED" "## PLANNING INCONCLUSIVE")` while waiting/active — `marker_received` -> step 9; `stalled` -> 9a.
+**ORCHESTRATOR RULE — ALL RUNTIMES (when `PLANNER_STALL_DETECTION_ENABLED` is `true`):** `TS=$(date +%s)`; repeat `PLANNER_STALL_RESULT=$(gsd_stall_watch "$TS" "{outputFile}" "${PHASE_DIR}"'/*-PLAN.md' "## PLANNING COMPLETE" "## PHASE SPLIT RECOMMENDED" "## ⚠ Source Audit" "## CHECKPOINT REACHED" "## PLANNING INCONCLUSIVE")` while waiting/active — `marker_received` -> step 9; `stalled` -> 9a.
+
+- **`false`:** issue the same Agent() call but omit `run_in_background`; await its ordinary runtime-native completion and pass the real returned result to step 9. Skip `gsd_stall_watch` entirely. This is not fire-and-forget; empty, truncated, or unrecognized returns still use step 9a.
 
 **If `CHUNKED_MODE` is `true`:** Skip the Agent() call above — proceed to step 8.5 instead.
 
@@ -1080,7 +1085,12 @@ Agent(
 )
 ```
 
-**ORCHESTRATOR RULE — ALL RUNTIMES:** `TS=$(date +%s)`; repeat `CHECKER_STALL_RESULT=$(gsd_stall_watch "$TS" "{outputFile}" "${PHASE_DIR}"'/*-PLAN.md' "## VERIFICATION PASSED" "## ISSUES FOUND")` while waiting/active.
+**Dispatch/wait gate — `PLANNER_STALL_DETECTION_ENABLED`:**
+- **`true` (default):** use `run_in_background=true` in the Agent() call above, then use `gsd_stall_watch` below.
+
+**ORCHESTRATOR RULE — ALL RUNTIMES (when `PLANNER_STALL_DETECTION_ENABLED` is `true`):** `TS=$(date +%s)`; repeat `CHECKER_STALL_RESULT=$(gsd_stall_watch "$TS" "{outputFile}" "${PHASE_DIR}"'/*-PLAN.md' "## VERIFICATION PASSED" "## ISSUES FOUND")` while waiting/active.
+
+- **`false`:** issue the same Agent() call but omit `run_in_background`; await its ordinary runtime-native completion and pass the real returned result to step 11. Skip `gsd_stall_watch` entirely. Treat a recognized returned marker exactly like `marker_received`; empty, truncated, or unrecognized returns still use step 11a.
 
 ## 11. Handle Checker Return
 
@@ -1172,7 +1182,12 @@ Agent(
 )
 ```
 
-**ORCHESTRATOR RULE — ALL RUNTIMES:** (7.99; no marker, mtimes only) `TS=$(date +%s)`; repeat `PLANNER_STALL_RESULT=$(gsd_stall_watch "$TS" "{outputFile}" "${PHASE_DIR}"'/*-PLAN.md')` while waiting/active — `stalled` -> 1) Accept as revised, to step 13, 2) Retry, 3) Stop.
+**Dispatch/wait gate — `PLANNER_STALL_DETECTION_ENABLED`:**
+- **`true` (default):** use `run_in_background=true` in the Agent() call above, then use `gsd_stall_watch` below.
+
+**ORCHESTRATOR RULE — ALL RUNTIMES (when `PLANNER_STALL_DETECTION_ENABLED` is `true`):** (7.99; no marker, mtimes only) `TS=$(date +%s)`; repeat `PLANNER_STALL_RESULT=$(gsd_stall_watch "$TS" "{outputFile}" "${PHASE_DIR}"'/*-PLAN.md')` while waiting/active — `stalled` -> 1) Accept as revised, to step 13, 2) Retry, 3) Stop.
+
+- **`false`:** issue the same Agent() call but omit `run_in_background`; await its ordinary runtime-native completion and pass the real returned result into the existing revision-return handling. Skip `gsd_stall_watch` entirely; an empty, truncated, or unrecognized result keeps the existing filesystem fallback.
 
 **If the planner returns `## REVISION_CONFLICT`:** follow the shared Conflict Return protocol in
 `gsd-core/references/revision-loop.md`, with this workflow's bindings: