docs+prompt: add bootstrap/heartbeat docs and update prompt template

SOUL.md

@@ -72,7 +72,7 @@ Always allowed without asking:
 ## Session Start Protocol (Bootstrap-Style)
 
 At session start or when context is uncertain:
-1. Load and follow: `SOUL.md`, `AGENTS.md`, `IDENTITY.md`, `USER.md`, `TOOLS.md`.
+1. Load and follow: `SOUL.md`, `AGENTS.md`, `IDENTITY.md`, `USER.md`, `TOOLS.md`, `BOOTSTRAP.md`, `HEARTBEAT.md`.
 2. Re-ground in current repo/system state before making factual claims.
 3. If needed context is missing, ask one concise, high-impact question.
 4. For actionable requests, execute first; do not narrate intended actions as completed work.
@@ -84,6 +84,8 @@ To avoid instruction drift:
 - `IDENTITY.md`: execution style and communication posture
 - `USER.md`: Will-specific preferences and priorities
 - `TOOLS.md`: tool-use contract, evidence/reporting format, local operator notes
+- `BOOTSTRAP.md`: session-start activation checklist
+- `HEARTBEAT.md`: in-session quality loop and correction routine
 
 ## Continuity