Add context builder, agent runner, and pipeline executor

core/context_builder.py:
  build_context() — assembles role-specific context from DB.
  PM gets everything; debugger gets gotchas/workarounds; reviewer
  gets conventions only; tester gets minimal context; security
  gets security-category decisions.
  format_prompt() — injects context into role templates.

agents/runner.py:
  run_agent() — launches claude CLI as subprocess with role prompt.
  run_pipeline() — executes multi-step pipelines sequentially,
  chains output between steps, logs to agent_logs, creates/updates
  pipeline records, handles failures gracefully.

agents/specialists.yaml — 8 roles with tools, permissions, context rules.
agents/prompts/pm.md — PM prompt for task decomposition.
agents/prompts/security.md — security audit prompt (OWASP, auth, secrets).

CLI: kin run <task_id> [--dry-run]
  PM decomposes → shows pipeline → executes with confirmation.

31 new tests (15 context_builder, 11 runner, 5 JSON parsing).
92 total, all passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agents/specialists.yaml

@@ -0,0 +1,104 @@
+# Kin specialist pool — roles available for pipeline construction.
+# PM selects from this pool based on task type.
+
+specialists:
+  pm:
+    name: "Project Manager"
+    model: sonnet
+    tools: [Read, Grep, Glob]
+    description: "Decomposes tasks, selects specialists, builds pipelines"
+    permissions: read_only
+    context_rules:
+      decisions: all
+      modules: all
+
+  architect:
+    name: "Software Architect"
+    model: sonnet
+    tools: [Read, Grep, Glob]
+    description: "Designs solutions, reviews structure, writes specs"
+    permissions: read_only
+    context_rules:
+      decisions: all
+      modules: all
+
+  debugger:
+    name: "Debugger"
+    model: sonnet
+    tools: [Read, Grep, Glob, Bash]
+    description: "Finds root causes, reads logs, traces execution"
+    permissions: read_bash
+    working_dir: project
+    context_rules:
+      decisions: [gotcha, workaround]
+
+  frontend_dev:
+    name: "Frontend Developer"
+    model: sonnet
+    tools: [Read, Write, Edit, Bash, Glob, Grep]
+    description: "Implements UI: Vue, CSS, components, composables"
+    permissions: full
+    working_dir: project
+    context_rules:
+      decisions: [gotcha, workaround, convention]
+
+  backend_dev:
+    name: "Backend Developer"
+    model: sonnet
+    tools: [Read, Write, Edit, Bash, Glob, Grep]
+    description: "Implements API, services, database, business logic"
+    permissions: full
+    working_dir: project
+    context_rules:
+      decisions: [gotcha, workaround, convention]
+
+  tester:
+    name: "Tester"
+    model: sonnet
+    tools: [Read, Write, Bash, Glob, Grep]
+    description: "Writes and runs tests, verifies fixes"
+    permissions: full
+    working_dir: project
+    context_rules:
+      decisions: []
+
+  reviewer:
+    name: "Code Reviewer"
+    model: sonnet
+    tools: [Read, Grep, Glob]
+    description: "Reviews code for quality, conventions, bugs"
+    permissions: read_only
+    context_rules:
+      decisions: [convention]
+
+  security:
+    name: "Security Engineer"
+    model: sonnet
+    tools: [Read, Grep, Glob, Bash]
+    description: "OWASP audit, auth checks, secrets scan, vulnerability analysis"
+    permissions: read_bash
+    working_dir: project
+    context_rules:
+      decisions_category: security
+
+# Route templates — PM uses these to build pipelines
+routes:
+  debug:
+    steps: [debugger, tester, frontend_dev, tester]
+    description: "Find bug → verify → fix → verify fix"
+
+  feature:
+    steps: [architect, frontend_dev, tester, reviewer]
+    description: "Design → implement → test → review"
+
+  refactor:
+    steps: [architect, frontend_dev, tester, reviewer]
+    description: "Plan refactor → implement → test → review"
+
+  hotfix:
+    steps: [debugger, frontend_dev, tester]
+    description: "Find → fix → verify (fast track)"
+
+  security_audit:
+    steps: [security, architect]
+    description: "Audit → remediation plan"