feat(agent-teams): add plugin for multi-agent team orchestration

New plugin with 7 presets (review, debug, feature, fullstack, research,
security, migration), 4 specialized agents, 7 slash commands, 6 skills
with reference docs, and Context7 MCP integration for research teams.

plugins/agent-teams/skills/parallel-debugging/references/hypothesis-testing.md

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+# Hypothesis Testing Reference
+
+Task templates, evidence formats, and arbitration decision trees for parallel debugging.
+
+## Hypothesis Task Template
+
+```markdown
+## Hypothesis Investigation: {Hypothesis Title}
+
+### Hypothesis Statement
+
+{Clear, falsifiable statement about the root cause}
+
+### Failure Mode Category
+
+{Logic Error | Data Issue | State Problem | Integration Failure | Resource Issue | Environment}
+
+### Investigation Scope
+
+- Files to examine: {file list or directory}
+- Related tests: {test files}
+- Git history: {relevant date range or commits}
+
+### Evidence Criteria
+
+**Confirming evidence** (if I find these, hypothesis is supported):
+
+1. {Observable condition 1}
+2. {Observable condition 2}
+
+**Falsifying evidence** (if I find these, hypothesis is wrong):
+
+1. {Observable condition 1}
+2. {Observable condition 2}
+
+### Report Format
+
+- Confidence: High/Medium/Low
+- Evidence: list with file:line citations
+- Causal chain: step-by-step from cause to symptom
+- Recommended fix: if confirmed
+```
+
+## Evidence Report Template
+
+```markdown
+## Investigation Report: {Hypothesis Title}
+
+### Verdict: {Confirmed | Falsified | Inconclusive}
+
+### Confidence: {High (>80%) | Medium (50-80%) | Low (<50%)}
+
+### Confirming Evidence
+
+1. `src/api/users.ts:47` — {description of what was found}
+2. `src/middleware/auth.ts:23` — {description}
+
+### Contradicting Evidence
+
+1. `tests/api/users.test.ts:112` — {description of what contradicts}
+
+### Causal Chain (if confirmed)
+
+1. {First cause} →
+2. {Intermediate effect} →
+3. {Observable symptom}
+
+### Recommended Fix
+
+{Specific code change with location}
+
+### Additional Notes
+
+{Anything discovered that may be relevant to other hypotheses}
+```
+
+## Arbitration Decision Tree
+
+```
+All investigators reported?
+├── NO → Wait for remaining reports
+└── YES → Count confirmed hypotheses
+          ├── 0 confirmed
+          │   ├── Any medium confidence? → Investigate further
+          │   └── All low/falsified? → Generate new hypotheses
+          ├── 1 confirmed
+          │   └── High confidence?
+          │       ├── YES → Declare root cause, propose fix
+          │       └── NO → Flag as likely cause, recommend verification
+          └── 2+ confirmed
+              └── Are they related?
+                  ├── YES → Compound issue (multiple contributing causes)
+                  └── NO → Rank by confidence, declare highest as primary
+```
+
+## Common Hypothesis Patterns by Error Type
+
+### "500 Internal Server Error"
+
+1. Unhandled exception in request handler (Logic Error)
+2. Database connection failure (Resource Issue)
+3. Missing environment variable (Environment)
+
+### "Race condition / intermittent failure"
+
+1. Shared state mutation without locking (State Problem)
+2. Async operation ordering assumption (Logic Error)
+3. Cache staleness window (State Problem)
+
+### "Works locally, fails in production"
+
+1. Environment variable mismatch (Environment)
+2. Different dependency version (Environment)
+3. Resource limits (memory, connections) (Resource Issue)
+
+### "Regression after deploy"
+
+1. New code introduced bug (Logic Error)
+2. Configuration change (Integration Failure)
+3. Database migration issue (Data Issue)