add reusable project skills (6 agnostic, 2 project-specific)

skills/session-protocol/SKILL.md

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+# Session Protocol
+
+How to structure and execute each development session efficiently.
+
+## Initialization
+
+1. **Full project scan first** — read the build file, all source files,
+   tests, docs. Ensures the full codebase is understood before making changes.
+2. **Check version control status** — identify any uncommitted work from
+   prior sessions.
+3. **Load companion skills** — `documentation`, `release-workflow`,
+   `testing-fuzzing`, `privacy-security`, `ci-cd-pipeline`.
+
+## Task Protocol
+
+1. **Impact analysis before code** — list every file and call site that needs
+   to change. Present for validation before writing code.
+2. **One feature per cycle** — one logical change per commit. Batch docs,
+   changelog, and version metadata with the feature.
+3. **Call site audit on completion** — verify every reference is updated.
+   Build + test + lint before declaring done.
+4. **Draft release cycle** — commit → push → tag → CI builds draft →
+   user tests → publish. Never ship without draft testing.