Implement CE-WP-0005 T01-T08: demo app — sessions, uploads, ZIP archive

Turn the MVP into a self-contained demo. Users now:
  1. Land on an empty-state and create a named session.
  2. Drag-drop or pick arbitrary PDFs into that session.
  3. Annotate, build evidence, link to form fields — all session-scoped.
  4. Export the whole session as a single .zip archive (manifest +
     per-document PDFs).
  5. Import a .zip back — into a new session, or merged into an
     existing one (documents deduped by SHA-256 fingerprint;
     annotations/evidence/links added additively).

Architecture:
- New shared types: SessionId, Session, SessionArchiveManifest +
  parseSessionArchiveManifest with schema-version validation.
- SessionService (engine/services/sessions.ts) handles lifecycle
  (create/rename/delete/setActive) + emits 4 new events through its
  own bus; SharedContracts.md §4 lists the additions.
- SessionProvider (work/SessionContext.tsx) owns the cross-session
  state: service, per-session PdfByteStore registry, per-session
  version counter that drives EngineProvider remounts after imports.
- EngineProvider becomes session-aware (sessionId prop drives per-
  session localStorage keys). Bumping engineRevision after
  restoreFromStorage forces consumers to re-render so restored repos
  show up immediately.
- PdfByteStore (source/pdf/byte-store.ts) holds Uint8Array bytes per
  document and mints blob URLs; ingestPdfFromFile is the upload
  entry-point that wraps the existing ingestPdf pipeline.
- ADR-0008 locks the ZIP layout (manifest.json + documents/<id>.pdf),
  the manifest schema (schemaVersion 1), and the merge-on-collision
  policy. JSZip is the only new dependency.
- App.tsx restructured: SessionProvider at the root, EngineProvider
  keyed by ${sessionId}:${version}, hash routing #/s/<id>[/forms/demo],
  SessionMenu top-bar, CreateFirstSession empty state.
- New DocumentRemoved event for per-document delete cleanup in
  CollectionList; engine.documents.remove() is the new service method.

Tests:
- Unit: 16 SessionService lifecycle + persistence tests;
  per-session snapshot round-trip; PdfByteStore + ingestPdfFromFile;
  SessionArchive parser; exportSessionZip + importSessionZip with
  create + merge + corrupt-archive paths.
- DOM: UploadDropzone, session-scoped CollectionList delete,
  SessionMenu create/switch/rename, routing parser.
- E2E: tests/integration/session-export-reimport.dom.test.tsx walks
  the full create → annotate → export → reimport flow and asserts
  the additive merge (deduped doc + doubled evidence rows).
- Legacy E2Es updated to use a seed-session helper instead of the
  removed fixture-button flow.

Known limitation (documented in ADR-0008): re-importing your own
freshly-exported ZIP creates duplicate annotations. Forward pointer
left for an importBundleId follow-up.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      jszip:
+        specifier: ^3.10.1
+        version: 3.10.1
       pdfjs-dist:
         specifier: ^4.4.168
         version: 4.10.38
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     engines: {node: '>=0.8.19'}
 
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@@ -2043,6 +2058,9 @@ packages:
     engines: {node: '>=6'}
     hasBin: true
 
+  jszip@3.10.1:
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     engines: {node: '>= 0.8.0'}
 
+  lie@3.3.0:
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     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
 
+  process-nextick-args@2.0.1:
+    resolution: {integrity: sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==}
+
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     engines: {node: '>=0.10.0'}
 
+  readable-stream@2.3.8:
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+
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     engines: {node: '>=0.4'}
 
+  safe-buffer@5.1.2:
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+
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     engines: {node: '>= 0.4'}
 
+  setimmediate@1.0.5:
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+
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@@ -2434,6 +2467,9 @@ packages:
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     engines: {node: '>= 0.4'}
 
+  string_decoder@1.1.1:
+    resolution: {integrity: sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==}
+
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     engines: {node: '>=4'}
@@ -2568,6 +2604,9 @@ packages:
       '@types/react':
         optional: true
 
+  util-deprecate@1.0.2:
+    resolution: {integrity: sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==}
+
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     engines: {node: ^18.0.0 || >=20.0.0}
@@ -4052,6 +4091,8 @@ snapshots:
 
   convert-source-map@2.0.0: {}
 
+  core-util-is@1.0.3: {}
+
   cross-spawn@7.0.6:
     dependencies:
       path-key: 3.1.1
@@ -4542,6 +4583,8 @@ snapshots:
 
   ignore@7.0.5: {}
 
+  immediate@3.0.6: {}
+
   import-fresh@3.3.1:
     dependencies:
       parent-module: 1.0.1
@@ -4549,6 +4592,8 @@ snapshots:
 
   imurmurhash@0.1.4: {}
 
+  inherits@2.0.4: {}
+
   internal-slot@1.1.0:
     dependencies:
       es-errors: 1.3.0
@@ -4667,6 +4712,8 @@ snapshots:
       call-bound: 1.0.4
       get-intrinsic: 1.3.0
 
+  isarray@1.0.0: {}
+
   isarray@2.0.5: {}
 
   isexe@2.0.0: {}
@@ -4691,6 +4738,13 @@ snapshots:
 
   json5@2.2.3: {}
 
+  jszip@3.10.1:
+    dependencies:
+      lie: 3.3.0
+      pako: 1.0.11
+      readable-stream: 2.3.8
+      setimmediate: 1.0.5
+
   keyv@4.5.4:
     dependencies:
       json-buffer: 3.0.1
@@ -4700,6 +4754,10 @@ snapshots:
       prelude-ls: 1.2.1
       type-check: 0.4.0
 
+  lie@3.3.0:
+    dependencies:
+      immediate: 3.0.6
+
   locate-path@6.0.0:
     dependencies:
       p-locate: 5.0.0
@@ -4876,6 +4934,8 @@ snapshots:
       ansi-styles: 5.2.0
       react-is: 17.0.2
 
+  process-nextick-args@2.0.1: {}
+
   prop-types@15.8.1:
     dependencies:
       loose-envify: 1.4.0
@@ -4975,6 +5035,16 @@ snapshots:
     dependencies:
       loose-envify: 1.4.0
 
+  readable-stream@2.3.8:
+    dependencies:
+      core-util-is: 1.0.3
+      inherits: 2.0.4
+      isarray: 1.0.0
+      process-nextick-args: 2.0.1
+      safe-buffer: 5.1.2
+      string_decoder: 1.1.1
+      util-deprecate: 1.0.2
+
   reflect.getprototypeof@1.0.10:
     dependencies:
       call-bind: 1.0.9
@@ -5054,6 +5124,8 @@ snapshots:
       has-symbols: 1.1.0
       isarray: 2.0.5
 
+  safe-buffer@5.1.2: {}
+
   safe-push-apply@1.0.0:
     dependencies:
       es-errors: 1.3.0
@@ -5095,6 +5167,8 @@ snapshots:
       es-errors: 1.3.0
       es-object-atoms: 1.1.2
 
+  setimmediate@1.0.5: {}
+
   shebang-command@2.0.0:
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@@ -5167,6 +5241,10 @@ snapshots:
       define-properties: 1.2.1
       es-object-atoms: 1.1.2
 
+  string_decoder@1.1.1:
+    dependencies:
+      safe-buffer: 5.1.2
+
   strip-bom@3.0.0: {}
 
   strip-json-comments@3.1.1: {}
@@ -5326,6 +5404,8 @@ snapshots:
     optionalDependencies:
       '@types/react': 18.3.29
 
+  util-deprecate@1.0.2: {}
+
   vite-node@2.1.9(@types/node@20.19.41):
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