PyAutoScientist 3b-1: spawn generator, drift CI, /spawn skill

[Jammy2211]

Summary

PyAutoScientist 3b-1 (PyAutoMind/issues/46) — the fresh-slate generator:

• scripts/spawn.py — stamps PyAutoMind-template + PyAutoMemory-template from the live repos per the partition rules in docs/pyautobrain/spawn_spec.md (tables mirrored as data; first-match; unmatched files fail the run). --write / --check (regenerate + diff, CI-friendly) / --stamp-family / dry-run default. Built-in canary privacy scan (slacs, b1938, …) over every generated file; SPAWNED_FROM provenance.
• docs/pyautobrain/spawn_spec.md amended with the bring-up classifications (human-approved in-session): Mind dashboard.md/overview.md/legacy autolens/ → DROP, docs/ resolved as work-type SKELETON; Memory scripts/+tests/ → KEEP, legacy paper-notes families → DROP; the wiki schema + Memory README become domain-neutral generated assets (the live schema is lensing-flavoured throughout and failed the canary); family pin stays 0.1.0.
• .github/workflows/spawn_drift.yml — weekly + dispatch: regenerate and diff against the published templates (the repos_sync drift pattern).
• skills/spawn/ — the /spawn skill: dry-run default; --apply is the sanctioned force-sync of the generated template repos (documented as the one exception to never-rewrite-history, banner in each template README).

Templates are published (public, template-flagged): PyAutoMind-template · PyAutoMemory-template.

API Changes

None — new script, new workflow, new skill; no existing file's behaviour changes (spec doc amended).

Test Plan

• Dry-run: zero unmatched, canary clean (both templates)
• --write → --check round-trips clean; drift negative test fires (tampered file flagged)
• repos_sync.py --check exits 0 inside a written PyAutoMind-template
• spawn_drift.yml parses; 54 files generated

Companion PR: PyAutoBrain (RTD walkthrough). No pending-release label — Mind is never released.

🤖 Generated with Claude Code