feat(P01-P05): multi-session support & execute-phase persona specialization — SESSION-01..05, PERSONA-01..11, CLI-01..04, INTEG-01..05

---ci---
phase: 1-5
milestone: v0.11
project: ci
status: execute
decisions:
  - id: D-092
    decision: Independent sessions via AgentSession (not shared state)
    rationale: Aligns with git-native model; sessions communicate through commits and .ciagent/ files
    confidence: 0.90
  - id: D-093
    decision: Personas as runtime configs (not new Agent classes)
    rationale: Less code, more flexible. Persona md files define domain knowledge and framework opinions.
    confidence: 0.88
  - id: D-094
    decision: Lead developer as task decomposer (not separate pipeline stage)
    rationale: EXECUTE stays one stage. Lead decomposes before execution, each persona group runs.
    confidence: 0.85
  - id: D-095
    decision: File-based git locking (not DB or IPC)
    rationale: Git-native. .session-lock files are simple JSON with session ID, timestamp, project slug.
    confidence: 0.87
  - id: D-096
    decision: Territory enforcement with warn/strict modes
    rationale: Warn for teams learning boundaries. Strict for mature projects. Configurable per-project.
    confidence: 0.82
  - id: D-097
    decision: Task decomposition by file patterns + requirement IDs
    rationale: File patterns are deterministic; no LLM needed. Requirement IDs in PLAN.md already map to domains.
    confidence: 0.88
requirements:
  covered: [SESSION-01, SESSION-02, SESSION-03, SESSION-04, SESSION-05, PERSONA-01, PERSONA-02, PERSONA-03, PERSONA-04, PERSONA-05, PERSONA-06, PERSONA-07, PERSONA-08, PERSONA-09, PERSONA-10, PERSONA-11, CLI-01, CLI-02, CLI-03, CLI-04, INTEG-01, INTEG-02, INTEG-03, INTEG-04, INTEG-05]
---/ci---

AGENTS.md

@@ -30,6 +30,8 @@ src/
    core/            # Core engine components
      artifacts.ts   # Legacy .ciagent/ artifact management (retained for backward compat)
     audit.ts       # Git-native audit trail — reads decisions/escalations from git log
+    agent-session.ts # Multi-session support: AgentSession, file-based git locking
+    session-manager.ts # SessionManager: concurrent session lifecycle management
     ciagent-files.ts    # .ciagent/ long-lived reference file management (PROJECT.md, ROADMAP.md, etc.)
     clarify.ts     # Clarify phase: question generation, default acceptance
     commit-builder.ts  # Structured commit message generation (---ci--- YAML blocks)
@@ -40,14 +42,18 @@ src/
     escalation.ts  # Escalation protocol: commits escalations as git artifacts
     git-branch.ts  # Branch lifecycle: phase/NN-slug, milestone/vX.X-slug
     git-context.ts # Project state reconstruction from git log + branches
+    persona-loader.ts  # Execute-time persona resolution from .config/opencode/agents/*.md
+    task-decomposer.ts # Plan decomposition into data/backend/frontend task groups
   types/           # Type definitions
-    commit-meta.ts # CIAgentMetadata, CommitDecision, CommitEscalation, ParsedCIAgentCommit
-    config.ts      # CIAgentConfig, AutonomyLevel, ModelProfile, DEFAULT_CIAGENT_CONFIG (includes backend)
+    commit-meta.ts # CIAgentMetadata, CommitDecision, CommitEscalation, ParsedCIAgentCommit (includes session field)
+    config.ts      # CIAgentConfig, AutonomyLevel, ModelProfile, SessionConfig, PersonaConfigSection, DEFAULT_CIAGENT_CONFIG (includes backend)
     decisions.ts   # Decision, ConfidenceLevel, DecisionCategory
     escalation.ts  # Escalation, EscalationType, EscalationResolution
     clarify.ts     # ClarifyQuestion, ClarifyResult
     specification.ts  # Specification parser (objective, requirements, constraints, out_of_scope)
     pipeline.ts    # PipelineStage, PipelineState, PhaseResult, STAGE_ORDER
+    persona.ts     # ExecutePersonaConfig, PersonaDomain, TerritoryConflict, DecomposedPlan, DEFAULT_PERSONAS
+    session.ts     # SessionInfo, SessionStatus, SessionConfig, DEFAULT_SESSION_CONFIG
   utils/           # File utilities (readFile, writeFile, ensureDir, readJSON, writeJSON)
   verification/    # 4-layer verification pipeline
     structural.ts  # Layer 1: file existence, imports wired, no stubs
@@ -197,7 +203,8 @@ IntelligenceBackend (unified interface)
 - **v0.10.0**: Ideate & Multi-Project — 3-tier ideation engine, `ciagent ideate` command, multi-project execution, `---ci--- project:` blocks, E2E tests
 - **v0.9.0**: Integration & hardening — OpenAI and Anthropic backends, all 19 agents with intrinsic mechanical logic, E2E v0.9 integration tests, parallel agent execution
 - **v0.8.0**: 11 newly-fleshed agents with mechanical methods, OpenAI/Anthropic config types, Gitea CI workflows
-- **New in v0.10**: IdeationEngine with mechanical/backend-enriched/cross-project tiers, `ciagent ideate` command with --category/--affected/--spec/--external/--cross-project/--project/--output flags, `IDEATE` pipeline stage between RESEARCH and PLAN, multi-project support with `active_projects` config and `--project all` flag, `---ci--- project: <slug>` commit blocks, `max_concurrent_projects` parallelization config
+- **New in v0.11**: Multi-session support with `SessionManager` and `AgentSession` for independent project pipelines running concurrently, execute-phase persona specialization (`lead-developer`, `data-engineer`, `backend-engineer`, `frontend-engineer`) with territory enforcement and task decomposition, `ciagent sessions` CLI command with list/status/cancel/cleanup subcommands, `--session <id>` flag on `ciagent run`, `---ci--- session:` commit metadata field, `sessions` and `personas` config sections
+- **v0.10.0**: Ideate & Multi-Project — 3-tier ideation engine, `ciagent ideate` command, multi-project execution, `---ci--- project:` blocks, E2E tests
 - **New backends (v0.9)**: OpenAIBackend (gpt-4o, API key auth, OpenAI-Organization header), AnthropicBackend (Claude, API key auth, anthropic-version header, tool use translation)
 - **Config expansion (v0.10)**: `ideation` section in config with categories, thresholds, external signals, cross-project, chaos; `active_projects` array; `max_concurrent_projects` in parallelization
 - **Auto-detection order**: opencode → openai → ollama-local → ollama-cloud → anthropic