meta(hermes): register session-handoff (mode: pending, intended: auto/productivity)

Without an entry, scripts/build-hermes.py fails ("unmapped skill" — every
skill in skills/ must appear in mapping exactly once). Registered under
the pending block alongside using-yt-tools and using-vds-ops because the
skill has bidirectional file-system side effects (read/write
.tasks/NEXT_SESSION.md) and warrants a behavioral audit before promotion.

intended.category = productivity (mirrors using-tasks/setup-tasks —
workflow-state continuity primitive, not engineering toolchain).

Build now reports 28 skills (14 auto / 2 manual / 9 skip / 3 pending).
SKIPPED.md gains an entry under "Pending" with the intended block
preserved across MVP iterations.

Closes [session-handoff-hermes-mapping].
Promotion to mode: auto deferred to a separate post-audit task.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dist-hermes/SKIPPED.md

@@ -17,5 +17,6 @@ Do not edit by hand — edit the mapping and re-run the build.
 
 ## Pending (deferred to follow-up tasks)
 
+- **session-handoff** — Writes .tasks/NEXT_SESSION.md (project-scope, sliding overwrite) and reads it on session start. Bidirectional file-system side-effect, opt-in via CLAUDE.md trigger-line. Behavioral audit via session-handoff-test-trigger required before promotion to auto. → intended: `mode: auto, category: productivity`
 - **using-vds-ops** — Calls mcp__vds-ops__* tools (read-only, but touches infrastructure). Behavioral audit via using-vds-ops-test-trigger required before promotion to auto. → intended: `mode: auto, category: mcp`
 - **using-yt-tools** — Shells out to yt-dlp + ffmpeg and writes ./yt-cache/ in cwd. Behavioral audit via using-yt-tools-test-trigger required before promotion to auto. → intended: `mode: auto, category: research`