skills: analog-emulation -- seal-keyed reuse (frontier, tri hot), the local board flow, the ngspice fixed-step recipe and the night-loop learnings #10519

Goal

Fold what the overnight loop of #10486 learned into .claude/skills/analog-emulation/SKILL.md, so the next tick or session goes faster and does not repeat mistakes: seal-keyed reuse (t27c frontier --only, tri hot), t27b test as the inner loop, the local openXC7 board flow (the Railway lab is not needed), the ngspice fixed-step backward-Euler recipe (#10505), the tightened speed-claim rule, the fast review path, the auto-merge/second-push rule, the dead-tri ratchet trap (#10514), the UNLISTED ledger pattern, the uberWAVE format and licence, and the one-element array literal defect (#10512).

Boundary

• .claude/skills/analog-emulation/SKILL.md. Text only.

Scenarios

• Given a tick that reviews a PR, When it follows the skill, Then it checks frontier and seal verify first and re-runs tests only when frontier says rebuild.
• Given a board milestone, When the agent reads the skill, Then it finds the local tool paths and the memory/disk checks.

Requirements

• FR-001: Every command the skill names MUST exist in target/release/tri --help, t27c --help, t27b usage or Homebrew.

Success Criteria

• t27c frontier --only specs/analog/linear.t27 --list and tri hot caches both run as the skill says (checked by hand, recorded in the PR body).