fix: code/cli acpx reliability 20260304 (#34020)

* agents: switch claude-cli defaults to bypassPermissions

* agents: add claude-cli default args coverage

* agents: emit watchdog stall system event for cli runs

* agents: test cli watchdog stall system event

* acpx: fallback to sessions new when ensure returns no ids

* acpx tests: mock sessions new fallback path

* acpx tests: cover ensure-empty fallback flow

* skills: clarify claude print mode without pty

* docs: update cli-backends claude default args

* docs: refresh cli live test default args

* gateway tests: align live claude args defaults

* changelog: credit claude/acpx reliability fixes

* Agents: normalize legacy Claude permission flag overrides

* Tests: cover legacy Claude permission override normalization

* Changelog: note legacy Claude permission flag auto-normalization

* ACPX: fail fast when ensure/new return no session IDs

* ACPX tests: support empty sessions new fixture output

* ACPX tests: assert ensureSession failure when IDs missing

* CLI runner: scope watchdog heartbeat wake to session

* CLI runner tests: assert session-scoped watchdog wake

* Update CHANGELOG.md

docs/help/testing.md

@@ -219,7 +219,7 @@ OPENCLAW_LIVE_SETUP_TOKEN=1 OPENCLAW_LIVE_SETUP_TOKEN_PROFILE=anthropic:setup-to
 - Defaults:
   - Model: `claude-cli/claude-sonnet-4-6`
   - Command: `claude`
-  - Args: `["-p","--output-format","json","--dangerously-skip-permissions"]`
+  - Args: `["-p","--output-format","json","--permission-mode","bypassPermissions"]`
 - Overrides (optional):
   - `OPENCLAW_LIVE_CLI_BACKEND_MODEL="claude-cli/claude-opus-4-6"`
   - `OPENCLAW_LIVE_CLI_BACKEND_MODEL="codex-cli/gpt-5.3-codex"`