chore: Bump version to 0.4.0

Key fix: Orphan cleanup now skips Claude processes in valid Gas Town
tmux sessions (gt-*/hq-*), preventing false kills of witnesses,
refineries, and deacon during startup.

Updated all component versions:
- gt CLI: 0.3.1 → 0.4.0
- npm package: 0.3.0 → 0.4.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.beads/config.yaml

@@ -62,12 +62,6 @@
 # - github.repo
 sync-branch: beads-sync
 
-# Gas Town custom types (bd-t5o8i)
-# These types are used by Gas Town infrastructure but are not core beads types.
-# They will be removed from beads built-in types (bd-find4) and configured here instead.
-types:
-  custom: "molecule,gate,convoy,merge-request,slot,agent,role,rig,event,message"
-
 # Cross-project dependencies (gt-o3is)
 # Maps project names to paths for external dependency resolution
 # Format: external:<project>:<capability> in bd dep commands

.beads/formulas/mol-backoff-test.formula.toml

@@ -1,95 +0,0 @@
-description = """
-Test molecule for verifying exponential backoff behavior.
-
-Uses SHORT intervals (2s base, 10s max) so you can observe multiple
-backoff cycles in under a minute.
-
-Expected backoff progression:
-- Cycle 0: 2s
-- Cycle 1: 4s
-- Cycle 2: 8s
-- Cycle 3+: 10s (capped)
-
-Full backoff cycle observable in ~24 seconds.
-
-## Running This Test
-
-1. Create a test agent bead (if not exists):
-   ```bash
-   bd create --type=agent --title="Backoff Test Agent" --id=hq-backoff-test
-   ```
-
-2. Run the deacon with this formula, or execute steps manually:
-   ```bash
-   gt mol step await-signal --agent-bead hq-backoff-test \
-     --backoff-base 2s --backoff-mult 2 --backoff-max 10s
-   ```
-
-3. Watch the idle counter increment on each timeout:
-   ```bash
-   bd show hq-backoff-test --json | jq '.[] | .labels'
-   ```
-
-4. Trigger activity to test signal wake:
-   ```bash
-   bd create --title="Wake signal" --silent  # Any bd command triggers activity
-   ```
-
-5. Reset idle counter after signal (caller responsibility):
-   ```bash
-   bd update hq-backoff-test --set-labels=idle:0
-   ```
-"""
-formula = "mol-backoff-test"
-version = 1
-
-[[steps]]
-id = "heartbeat"
-title = "Touch heartbeat"
-description = """
-Touch heartbeat to show we're alive.
-
-```bash
-gt deacon heartbeat "backoff test cycle"
-```
-
-This updates the deacon's heartbeat file to signal liveness.
-"""
-
-[[steps]]
-id = "await-signal"
-title = "Wait with exponential backoff (SHORT intervals)"
-needs = ["heartbeat"]
-description = """
-Wait for activity with exponential backoff using TEST intervals.
-
-**IMPORTANT**: This uses SHORT intervals for testing:
-- Base: 2s (production: 60s)
-- Multiplier: 2
-- Max: 10s (production: 10m)
-
-```bash
-gt mol step await-signal --agent-bead hq-backoff-test \
-  --backoff-base 2s --backoff-mult 2 --backoff-max 10s
-```
-
-**Expected behavior:**
-
-| Idle Cycles | Timeout |
-|-------------|---------|
-| 0           | 2s      |
-| 1           | 4s      |
-| 2           | 8s      |
-| 3+          | 10s     |
-
-**On timeout**: The command auto-increments the `idle:N` label on the agent bead.
-Continue to the next patrol cycle (loop back to heartbeat).
-
-**On signal**: Activity was detected. Reset the idle counter:
-```bash
-bd update hq-backoff-test --set-labels=idle:0
-```
-Then loop back to heartbeat for the next cycle.
-
-**To exit**: When context is high or testing is complete, exit cleanly.
-"""