Phase 2: core domain, policy engine, packet API, Clerical screen

Migration 0003: projects, aliases, renumbers, units, packets and every child table,
change orders, assets, documents, ITPs, station limits, department weld flag.
Policy package: Principal, PacketState, Action rules, custody, preconditions,
CO hold, order of checks, can/blocked/holder on reads. docs/POLICY.md with the
tightenings table for Seth. Write pipeline: FOR UPDATE, CAS on status and dept,
If-Match row versions, server-assigned numbers, field CAS, version bump, packet
log, audit, NOTIFY, signatures, IT reasons, filed lock and HMAC seal.
API: /api/packets (header, transitions, work orders, pages, docs, move, remove,
BOM, shorts, welds, heat tags, heat table, stage, checklist, clock, warehouse
stage, Q.C., change orders, log, seal), /api/projects, /api/units, /api/assets,
/_blob. Frontend: Clerical home, projects and units, packet page with pdf.js
and QR codes, hand draft, heat map, send to warehouse, department or Q.C.
Tests: policy matrix, API, concurrency, schema, projects; Playwright Clerical
draft scenario. Verified on docker-1 with the CI stack and the Samba DC.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

CHANGELOG.md

@@ -6,6 +6,16 @@ All notable changes to this project are recorded here. The format follows [Keep
 
 ### Added
 
+- Phase 2: core domain. Migration 0003 with projects, project aliases and renumber history, units, packets and every child table (work orders, pages, BOM lines, shorts and receipts, welds, heat tags, heat table placements, stages, warehouse stage rows, transitions, Q.C. inspections and history, seals, packet log, VISUAL state), change orders with items, required departments and verifications, assets, packet documents, Q.C. documents, ITPs, user station limits and the department weld flag. Append-only triggers, soft-delete columns with partial unique indexes, server-assigned counters on packets.
+- The policy engine in Python (`server/packetstation/policy/`): Principal, PacketState, the Action enum, one rule per action, custody, named preconditions, the change-order hold, and the order of checks from the plan. Every packet read returns `can`, `blocked` with reasons, and `holder`. docs/POLICY.md lists the rules and the tightenings against the old build for Seth.
+- The write pipeline: one transaction per write with the packet row locked, the policy decision, compare-and-set on the expected status and department (409 "someone else already took this step" with the current state), If-Match row versions on child rows, server-assigned weld, heat tag, page and change order numbers, field-level compare-and-set on header scalars, packet version bump, packet log and audit rows, NOTIFY. Signatures through the phase 1 helper on every action the plan marks. Admin edits need an IT reason and are marked in the packet log and the audit. Filed packets are locked; filing writes an HMAC seal and Admin reopen breaks it with a reason.
+- The packet API under `/api/packets`: list for the boards with the basic search, read, hand-made draft, header edit, transitions, work orders, pages, documents, move, remove, closed in VISUAL, data book date, reopen, seal, log, BOM, shorts and receipts, welds, heat tags, heat table, stage fields, checklist, clock, warehouse stage, Q.C. inspection, change orders (issue, approve, reject, hold, verify).
+- `/api/projects` and `/api/units`: create, edit with field compare-and-set, units one or several at a time, renumber with aliases and history, soft delete with a reason, number lookup through aliases.
+- `/api/assets` upload (type by content, 25 MB, sha256, stored by id under ASSETS_DIR, PDF page count) and `/_blob/{id}` served with a session, Content-Disposition and nosniff.
+- Input cleaning and limits on the server (`text.py`): the old cleanText rules and per-field lengths; bodies over 200 KB refused.
+- Frontend: the home layout (headline, KPIs, attention, find bar with the basic search and the two-step project and unit picker, boards and list view), the Clerical screen (Changes to approve, Flagged, Going to the warehouse, Ready to close, Ready for data book, Filed; projects and units with new project and unit sheets, renumbering, move packet), the packet page (header, Drawing tab with pdf.js, Materials, Work orders with QR codes, Documents, History) with every control driven by `can` and `blocked`, hand-made draft creation, the heat map question, send to warehouse, send straight to a department or Q.C., signature and IT reason sheets, live refresh from server events.
+- Tests: the full policy matrix (every transition as every role in every status), custody, short-parts and change-order exceptions, preconditions, compare-and-set conflicts and row versions per table, server-assigned numbers under concurrent inserts, the audit and packet log rows, projects and units, assets. A Playwright scenario for the Clerical draft flow against the CI stack.
+- `/api/departments` now returns station ids and the weld flag.
 - Phase 1: identity. Sign-in with the domain account and password against PESCO's Active Directory over LDAPS (search with the service account, then bind as the user; nested groups resolved; disabled accounts refused). Roles are the union of a person's `PS-*` groups, mapped by a table derived from the department list.
 - Server-side sessions: HttpOnly, SameSite=Strict cookie, idle sign-out after 15 minutes, absolute 12 hours for password sessions and 10 hours for PIN sessions, server-recorded lock after 3 idle minutes or a tab hidden for over a minute, step-up unlock with PIN or password. Origin and `X-Requested-With` check on every state-changing request.
 - Optional Packet Station PIN, 6 to 12 digits, set by the user with their domain password, hashed with Argon2id. PIN sign-in by employee ID on registered devices only. Five wrong attempts disable the PIN; three wrong attempts at unlock or signature end the session.