Add scope-stack builders, URL-context resolver, workspace executor

[RhysSullivan]

• scope-stack.ts emits the global / workspace stacks the plan calls for
  (innermost first), with deterministic prefixed scope ids and the new
  Me / + Global naming.
• url-context.ts resolves /:org and /:org/:workspace URL segments to the
  organization + workspace rows (no membership check — that stays in
  the protected middleware).
• executor.ts exposes createGlobalExecutor and createWorkspaceExecutor;
  makeExecutionStack now takes a context object so the protected API and
  MCP session DO can swap in a workspace context without touching the
  factory shape.
• Test harness now reuses buildGlobalScopeStack so prod and test stay in
  lock-step.

No callers of the workspace path yet — chunk 7 wires it through the
HTTP layer.

[RhysSullivan]

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• WIP: move file routes under /$org and reshape auth.me #507 : 2 dependent PRs (#508 , #514 )
• Add scope-stack builders, URL-context resolver, workspace executor #506 👈 (View in Graphite)
• Add workspaces CRUD API under OrgHttpApi #505
• Cut over scope ids to deterministic prefixed form #504
• Add organizations.handle and workspaces table #503
• Add cloud id helpers: prefixed local ids, scope id constructors, handle slugifier #502
• main

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