fix(#3801): register inline_plan_threshold in the defaults manifest and correct the docs (#4019)

* fix(#3801): register inline_plan_threshold in the defaults manifest (default 2) and correct settings-advanced

* chore(#3801): changeset fragment (pr number backfilled after PR creation)

* chore(#3801): backfill changeset PR number (4019)

* test(#3801): parse the defaults table with the shared markdown-table parser

---------

Co-authored-by: sim <sim@local>

src/config-loader.cts

@@ -134,6 +134,7 @@ const CONFIG_DEFAULTS = {
   security_block_on: _getNestedConfigDefault('workflow', 'security_block_on'),
   post_planning_gaps: _getNestedConfigDefault('workflow', 'post_planning_gaps'),
   smart_zone_tokens: _getNestedConfigDefault('workflow', 'smart_zone_tokens'),
+  inline_plan_threshold: _getNestedConfigDefault('workflow', 'inline_plan_threshold'), // #3801
   max_prompt_tokens: _getNestedConfigDefault('review', 'max_prompt_tokens'),
 };
 

src/config.cts

@@ -111,6 +111,11 @@ const SCHEMA_DEFAULTS: Record<string, unknown> = {
   // manifest default rather than "Key not found". Derived from the defaults manifest so
   // the manifest stays the single source of truth.
   'planning.pr_strict': CONFIG_DEFAULTS.pr_strict,
+  // #3801: execute-plan reads this key on every run; an absent key must resolve
+  // to the manifest default (2) rather than "Key not Found" — previously the
+  // effective default existed only as the workflow's shell fallback and the
+  // docs disagreed (settings-advanced said 3). Manifest stays the one owner.
+  'workflow.inline_plan_threshold': CONFIG_DEFAULTS.inline_plan_threshold,
 };
 
 /**