feat(context): reasoning-thread continuity, L3 doc filtering, and gate hardening

Threads reasoning_content across inference calls and journal renders, filters
markdown noise out of L3 repo-knowledge retrieval, adds PlanLinter H3 checks,
and tightens filesystem tool output/dir-listing behavior surfaced by prior
live QA (see project_readloop_campaign memory).

core/config/src/main/kotlin/com/correx/core/config/CorrexConfig.kt

@@ -94,6 +94,10 @@ data class ProjectConfig(
     companion object {
         val DEFAULT_IGNORES: List<String> = listOf(
             ".git", "node_modules", "build", "target", ".gradle", "dist", ".idea", ".opencode",
+            // Role-prompt templates: loaded by workflow config as LLM system prompts, not project
+            // docs — indexing them lets a stage `file_read` another role's prompt as if it were
+            // documentation.
+            "examples/workflows/prompts",
         )
     }
 }