chore: add shared skills catalog (19 skills), installers, manifest, validator

skills/conventional-commits-and-pr/SKILL.md

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+---
+name: conventional-commits-and-pr
+description: Use when generating commit messages, structuring pull request descriptions, or maintaining changelogs following the Conventional Commits specification.
+---
+
+# Conventional Commits & Pull Request Documentation
+
+## Purpose
+Format commit messages and PR descriptions consistently according to the Conventional Commits 1.0.0 specification for automated versioning and transparent project history.
+
+## Commit Message Format
+
+```
+<type>[optional scope]: <description>
+
+[optional body]
+
+[optional footer(s)]
+```
+
+### Types
+- **`feat`**: A new feature (correlates with `MINOR` in Semantic Versioning).
+- **`fix`**: A bug fix (correlates with `PATCH` in Semantic Versioning).
+- **`docs`**: Documentation only changes.
+- **`style`**: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc).
+- **`refactor`**: A code change that neither fixes a bug nor adds a feature.
+- **`perf`**: A code change that improves performance.
+- **`test`**: Adding missing tests or correcting existing tests.
+- **`build`**: Changes that affect the build system or external dependencies.
+- **`ci`**: Changes to CI configuration files and scripts.
+- **`chore`**: Other changes that don't modify src or test files.
+
+### Breaking Changes
+Indicated by an exclamation mark `!` after the type/scope or `BREAKING CHANGE:` in the footer (correlates with `MAJOR` in SemVer):
+```
+feat(api)!: drop legacy v1 authentication endpoints
+```
+
+## Pull Request Template Structure
+
+```markdown
+## Summary
+Concise 2-3 sentence overview of what this PR accomplishes and why.
+
+## Key Changes
+- **Area 1:** Bullet point explaining concrete change.
+- **Area 2:** Bullet point explaining concrete change.
+
+## Verification & Testing
+- [x] Unit tests passing (`pnpm test`)
+- [x] Tested locally with [scenario description]
+```