feat(mcp): model TaskMaestro and Teams as composable execution layers (#1309)

[JeremyDev87]

Summary

• Introduce ExecutionPlan with outerExecution and optional innerCoordination layers
• Add 'taskmaestro+teams' composable strategy: TaskMaestro as outer transport, Teams as inner coordination
• Add execution-plan.ts with builder functions (buildSimplePlan, buildNestedPlan) and serializeExecutionPlan for handler consumption
• All existing strategies (subagent, taskmaestro, teams) now populate executionPlan in DispatchResult
• Full backward compatibility: existing API unchanged

Test plan

• Type check passes (tsc --noEmit)
• All 5934 existing tests pass (237 files)
• New execution-plan unit tests: layer factories, simple/nested plans, serialization
• New agent.types tests: ExecutionLayer union, ExecutionPlan, composable strategy
• New agent.service tests: taskmaestro+teams dispatch, executionPlan in all strategies, backward compat
• Handler enum updated and tested

Closes #1309

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Apr 4, 2026 10:55am

[JeremyDev87]

Review: ✅ APPROVE

CI Status: ALL PASS (after lint fix)

Code Quality:

• ExecutionPlan type: Clean outerExecution + optional innerCoordination model
• taskmaestro+teams strategy: New composable strategy alongside existing single strategies
• Backward compatible: subagent/taskmaestro/teams still work as before, now with executionPlan populated
• agent.service.ts: Dispatch logic handles nested plan construction
• execution-plan.ts: New module with types and builder
• Tests: ~180 lines covering composable strategy, all single strategies, backward compat, failed agents

Architecture:

• Outer/inner layer separation is clean
• executionPlan is optional on dispatch result — existing clients unaffected
• Composable hint text guides clients on nested behavior

Checklist:

• CI ALL PASS
• Backward compatible
• No any types
• Comprehensive test coverage

✅ Composable execution model established.