refactor: replace autoChain with projectTick queue scanning

Remove hard-coded auto-chain dispatch (DEV done→QA, QA fail→DEV) and
replace with a general-purpose projectTick service that scans the queue
and fills free worker slots after every state transition.

- Create lib/services/tick.ts: consolidates shared helpers and core
  projectTick() function from duplicated code in work-start/auto-pickup
- work_finish: replaces auto-chain block with projectTick call
- work_start: adds projectTick after dispatch to fill parallel slots
- auto_pickup: delegates per-project loop to projectTick
- Remove autoChain from Project type, migration code, and project-register
- Remove scheduling config dependency from work_finish
- Net -112 lines: simpler, self-healing pipeline

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/tools/project-register.ts

@@ -204,7 +204,6 @@ export function createProjectRegisterTool(api: OpenClawPluginApi) {
         deployUrl,
         baseBranch,
         deployBranch,
-        autoChain: false,
         channel: context.channel,
         roleExecution,
         dev: emptyWorkerState([...DEV_TIERS]),