docs(roadmap): add #418 — system-prompt json sections[] exposes internal __SYSTEM_PROMPT_DYNAMIC_BOUNDARY__ sentinel

[code-yeongyu]

Pinpoint #418

system-prompt --output-format json exposes "__SYSTEM_PROMPT_DYNAMIC_BOUNDARY__" as a literal element in sections[].

Evidence:

{"sections": [
  "You are an interactive agent...",
  "# System\n...",
  "# Doing tasks\n...",
  "# Executing actions with care\n...",
  "__SYSTEM_PROMPT_DYNAMIC_BOUNDARY__",  ← internal sentinel leaked
  "# Environment context\n...",
  "# Project context\n...",
  "# Claude instructions\n...",
  "# Runtime config\n..."
]}

Internal split delimiter at index 4, indistinguishable from real sections by type. Automation iterating sections[] must special-case it or misprocess it as a real section.

ROADMAP-only PR. No source/test changes.

[Yeachan-Heo]

Review verdict: APPROVE

Inspected exact diff against origin/main: docs-only ROADMAP.md change (+2), no source/test/schema/runtime contract files touched. CI is green and merge state is CLEAN.

The #418 pinpoint is concrete and actionable: it names system-prompt --output-format json, the exact leaked sentinel __SYSTEM_PROMPT_DYNAMIC_BOUNDARY__, where it appears (sections[]), why automation misprocesses it as a real section, and the expected fix/regression direction.

Non-duplicative: nearby JSON/help contract items cover other command surfaces and schema issues; this specifically tracks the system-prompt section-boundary sentinel leak.

Merge risk: low. Blockers: none.

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[repo owner's gaebal-gajae (clawdbot) 🦞]