fix(skills): pull upstream skill runtime resolution to stop event-loop starvation

The fork's listRuntimeSkillEntries rematerialized every skill's files from
the DB on every heartbeat run dispatch — fs.rm + fs.mkdir + per-file
readFile/writeFile, sequentially per skill. With 24 configured skills and
5 concurrent agents, this saturated the Node event loop badly enough that
executeRun continuations couldn't reach activeRunExecutions.add() within
the orphan-reaper's 5-min threshold, causing reaper to false-positive runs
as "process_lost".

Upstream's listRuntimeSkillEntries calls resolveRuntimeSkillSource, which
checks if the materialized directory already exists on disk and short-
circuits when it does. Fixes the symptom at the root.

Replaces these files with upstream/master content:
  - server/src/services/company-skills.ts
  - server/src/services/heartbeat.ts
  - server/src/services/workspace-runtime.ts
  - server/src/services/company-portability.ts
  - server/src/routes/company-skills.ts
  - server/src/routes/agents.ts
  - packages/adapter-utils/src/server-utils.ts

Pulls in supporting upstream files:
  - server/src/services/catalog-provenance.ts
  - server/src/services/skills-catalog.ts
  - server/src/services/github-fetch.ts
  - server/src/services/portable-path.ts
  - packages/skills-catalog/ (new package)
  - packages/db document_annotation_* schema + migration 0091
  - packages/shared document-annotation types/validators

Drops fork features (to be re-evaluated later):
  - Gitea/Forgejo git skill sources (server/src/services/git-source.ts deleted)
  - PAT support for private skill repos
  - Fork-specific secret-export portability extensions

Adds agentId: null to acquireRunLease test-probe call in routes/agents.ts
to satisfy the fork's environment-runtime agentId requirement (kept).

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

packages/shared/src/validators/index.ts

@@ -67,8 +67,9 @@ export {
   companySkillUsageAgentSchema,
   companySkillDetailSchema,
   companySkillUpdateStatusSchema,
+  companySkillAuditFindingSchema,
+  companySkillAuditResultSchema,
   companySkillImportSchema,
-  companySkillUpdateAuthSchema,
   companySkillProjectScanRequestSchema,
   companySkillProjectScanSkippedSchema,
   companySkillProjectScanConflictSchema,
@@ -76,11 +77,23 @@ export {
   companySkillCreateSchema,
   companySkillFileDetailSchema,
   companySkillFileUpdateSchema,
+  catalogSkillKindSchema,
+  catalogSkillFileSchema,
+  catalogSkillSchema,
+  catalogSkillListQuerySchema,
+  catalogSkillFileDetailSchema,
+  companySkillInstallCatalogSchema,
+  companySkillInstallCatalogResultSchema,
+  companySkillInstallUpdateSchema,
+  companySkillResetSchema,
   type CompanySkillImport,
   type CompanySkillProjectScan,
   type CompanySkillCreate,
   type CompanySkillFileUpdate,
-  type CompanySkillUpdateAuth,
+  type CatalogSkillListQuery,
+  type CompanySkillInstallCatalog,
+  type CompanySkillInstallUpdate,
+  type CompanySkillReset,
 } from "./company-skill.js";
 export {
   agentSkillStateSchema,
@@ -154,6 +167,21 @@ export {
   type ProjectExecutionWorkspacePolicy,
 } from "./project.js";
 
+export {
+  createDocumentAnnotationCommentSchema,
+  createDocumentAnnotationThreadSchema,
+  documentAnnotationAnchorConfidenceSchema,
+  documentAnnotationAnchorSelectorSchema,
+  documentAnnotationAnchorStateSchema,
+  documentAnnotationTextPositionSelectorSchema,
+  documentAnnotationTextQuoteSelectorSchema,
+  documentAnnotationThreadStatusSchema,
+  updateDocumentAnnotationThreadSchema,
+  type CreateDocumentAnnotationComment,
+  type CreateDocumentAnnotationThread,
+  type UpdateDocumentAnnotationThread,
+} from "./document-annotation.js";
+
 export {
   createIssueSchema,
   createIssueInputSchema,