feat: add 6 agents + 5 slash commands for full coverage (v2.7.0) (#293)

Phase 3: 6 new agents (all 9 categories covered) + 5 slash commands.

commands/changelog.md

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+---
+name: changelog
+description: Generate changelogs from git history and validate conventional commits. Usage: /changelog <generate|lint> [options]
+---
+
+# /changelog
+
+Generate Keep a Changelog entries from git history and validate commit message format.
+
+## Usage
+
+```
+/changelog generate [--from <tag>] [--to HEAD]    Generate changelog entries
+/changelog lint [--range <from>..<to>]             Lint commit messages
+```
+
+## Examples
+
+```
+/changelog generate --from v2.0.0
+/changelog lint --range main..dev
+/changelog generate --from v2.0.0 --to v2.1.0 --format markdown
+```
+
+## Scripts
+- `engineering/changelog-generator/scripts/generate_changelog.py` — Parse commits, render changelog
+- `engineering/changelog-generator/scripts/commit_linter.py` — Validate conventional commit format
+
+## Skill Reference
+→ `engineering/changelog-generator/SKILL.md`

commands/competitive-matrix.md

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+---
+name: competitive-matrix
+description: Build competitive analysis matrices with scoring and gap analysis. Usage: /competitive-matrix <analyze> [options]
+---
+
+# /competitive-matrix
+
+Build competitive matrices with weighted scoring, gap analysis, and market positioning insights.
+
+## Usage
+
+```
+/competitive-matrix analyze <competitors.json>                    Full analysis
+/competitive-matrix analyze <competitors.json> --weights pricing=2,ux=1.5    Custom weights
+```
+
+## Input Format
+
+```json
+{
+  "your_product": { "name": "MyApp", "scores": {"ux": 8, "pricing": 7, "features": 9} },
+  "competitors": [
+    { "name": "Competitor A", "scores": {"ux": 7, "pricing": 9, "features": 6} }
+  ],
+  "dimensions": ["ux", "pricing", "features"]
+}
+```
+
+## Examples
+
+```
+/competitive-matrix analyze competitors.json
+/competitive-matrix analyze competitors.json --format json --output matrix.json
+```
+
+## Scripts
+- `product-team/competitive-teardown/scripts/competitive_matrix_builder.py` — Matrix builder
+
+## Skill Reference
+→ `product-team/competitive-teardown/SKILL.md`

commands/pipeline.md

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+---
+name: pipeline
+description: Detect stack and generate CI/CD pipeline configs. Usage: /pipeline <detect|generate> [options]
+---
+
+# /pipeline
+
+Detect project stack and generate CI/CD pipeline configurations for GitHub Actions or GitLab CI.
+
+## Usage
+
+```
+/pipeline detect [<project-dir>]                    Detect stack, tools, and services
+/pipeline generate [--platform github|gitlab]       Generate pipeline YAML
+```
+
+## Examples
+
+```
+/pipeline detect ./my-project
+/pipeline generate --platform github
+/pipeline generate --platform gitlab --stages build,test,deploy
+```
+
+## Scripts
+- `engineering/ci-cd-pipeline-builder/scripts/stack_detector.py` — Detect stack and tooling
+- `engineering/ci-cd-pipeline-builder/scripts/pipeline_generator.py` — Generate pipeline YAML
+
+## Skill Reference
+→ `engineering/ci-cd-pipeline-builder/SKILL.md`

commands/tdd.md

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+---
+name: tdd
+description: Generate tests, analyze coverage, and run TDD workflows. Usage: /tdd <generate|coverage|validate> [options]
+---
+
+# /tdd
+
+Generate tests, analyze coverage, and validate test quality using the TDD Guide skill.
+
+## Usage
+
+```
+/tdd generate <file-or-dir>     Generate tests for source files
+/tdd coverage <test-dir>        Analyze test coverage and gaps
+/tdd validate <test-file>       Validate test quality (assertions, edge cases)
+```
+
+## Examples
+
+```
+/tdd generate src/auth/login.ts
+/tdd coverage tests/ --threshold 80
+/tdd validate tests/auth.test.ts
+```
+
+## Scripts
+- `engineering-team/tdd-guide/scripts/test_generator.py` — Generate test cases
+- `engineering-team/tdd-guide/scripts/coverage_analyzer.py` — Coverage analysis
+- `engineering-team/tdd-guide/scripts/test_quality_checker.py` — Quality validation
+
+## Skill Reference
+→ `engineering-team/tdd-guide/SKILL.md`

commands/tech-debt.md

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+---
+name: tech-debt
+description: Score, track, and prioritize technical debt. Usage: /tech-debt <scan|score|report> [options]
+---
+
+# /tech-debt
+
+Scan codebases for technical debt, score severity, and generate prioritized remediation plans.
+
+## Usage
+
+```
+/tech-debt scan <project-dir>           Scan for debt indicators
+/tech-debt score <project-dir>          Calculate debt score (0-100)
+/tech-debt report <project-dir>         Full report with remediation plan
+```
+
+## Examples
+
+```
+/tech-debt scan ./src
+/tech-debt score . --format json
+/tech-debt report . --output debt-report.md
+```
+
+## Scripts
+- `engineering/tech-debt-tracker/scripts/debt_scanner.py` — Detect debt patterns
+- `engineering/tech-debt-tracker/scripts/debt_scorer.py` — Calculate severity scores
+- `engineering/tech-debt-tracker/scripts/remediation_planner.py` — Generate fix plans
+- `engineering/tech-debt-tracker/scripts/trend_tracker.py` — Track debt over time
+- `engineering/tech-debt-tracker/scripts/cost_estimator.py` — Estimate remediation cost
+
+## Skill Reference
+→ `engineering/tech-debt-tracker/SKILL.md`