Title#

feat: Make WorktreeService config-driven (base branch, branch prefix)

Problem#

WorktreeService had hardcoded origin/master and a hardcoded default 'feat' branch prefix, making branch management impossible to configure per tenant.

Task / Link#

Closes #354

Changes#

• Inject TenantConfigService into WorktreeService via constructor
• Replace hardcoded origin/master with origin/${tenantConfig.defaultBaseBranch}
• Replace hardcoded branchPrefix = 'feat' default with tenantConfig.branchPrefix (caller-provided prefix still takes precedence)
• Import TenantModule in WorktreeModule
• Add TenantConfigService mock to unit tests; add test cases for non-default base branch (main) and config-driven prefix

Notes#

• 🔧 Also fixed pre-existing watchdog test failures caused by STUCK_THRESHOLD_MS env var being set to 99999999 in the agent environment — added beforeEach/afterEach to pin thresholds in tests so they are isolated from environment config

Testing#

• Unit tests: all 772 pass (including new worktree and tenant-config tests)
• Lint: clean
• Verified origin/main is used when defaultBaseBranch: 'main' is configured
• Verified explicit caller-provided branchPrefix overrides the config value