chore(workspace): add hardened startup/security workflows and skill suite

skills/git-workspace-hygiene/references/commit-template.md

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+# Commit Message Template
+
+Use concise scope-based messages:
+
+- `boot: harden startup checks`
+- `skills: add calendar-sentinel and inbox-triage`
+- `security: tighten prompt-injection boundaries`
+- `docs: update USER preferences`
+
+Format:
+
+`<scope>: <single-line summary>`
+
+Body (optional):
+
+- why change was needed
+- key files touched
+- notable risk/rollback notes