docs(agents): list active handoffs so the FreeBSD agent finds them on startup

Add an "Active handoffs" entry under Multiagent Workflow pointing to
FREEBSD-BUILD-LANE-HANDOFF.md and CLAWDIE-INSTALLER-HANDOFF.md. AGENTS.md
already tells the FreeBSD agent to read active docs/*-HANDOFF.md on startup;
this names the current ones directly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

AGENTS.md

@@ -127,6 +127,13 @@ See `docs/COLIBRI-EXTERNAL-MCP-PROTOTYPE.md` and
 ## Multiagent Workflow
 
 - **Handoff doc:** `docs/<FEATURE>-HANDOFF.md` — always update before handing off
+- **Active handoffs:**
+  - `docs/FREEBSD-BUILD-LANE-HANDOFF.md` — FreeBSD agent (Codex): build the
+    Colibri and zot binaries, run the clawdie-iso build, boot, and run the
+    acceptance runbook plus the Hermes rc.d checks (ISO Gate 1 runtime proof
+    for Priority 1).
+  - `docs/CLAWDIE-INSTALLER-HANDOFF.md` — FreeBSD agent (Codex): `clawdie` ZFS
+    layout + service install validation.
 - **Proof gate tracker:** `cargo run --bin proof-gate-tracker`
 - **Platform matrix:** `cargo test --test platform-matrix`
 - **External MCP smoke:** see `docs/COLIBRI-EXTERNAL-MCP-PROTOTYPE.md`