fix(curation): kill dev-artefact leak + rename agent honestly

Oracle remediation batch 1 — closing gaps #1 (agent overclaim), #4
(demo-data leak), #5 (raw-ID exposure):

- src/lib/flowCuration.ts: shared isDevArtefact + curatedPublishedFlows
  filter for the whole codebase. Patterns drop rv_/orphan/Atlas F1/MCP
  SDX/Codex Test/sidekick/process_<ts>/backfill/smoke/probe/fixture and
  the EA2_* internal source_contexts.
- src/scenes/Hub.tsx: loadPublishedFlows uses the shared curator
- src/lib/agentTools.ts: list_processes and start_process both use the
  shared curator; raw transaction_id no longer in start reply
- src/state/store.ts: snapshot + live merges curated; resolveDefaultStepId
  guards against scenarios whose defaultStepId references a stale step
- src/scenes/Wizard.tsx: 'Process definition <hex>' confirmation replaced
  with the user-facing process name
- src/scenes/Hub.tsx: start toast no longer shows transaction_id prefix
- src/scenes/Agent.tsx + App.tsx + Landing.tsx: rename Pi -> FlowMaster
  Command Assistant. Welcome message says explicitly that this is a
  deterministic router and the LLM agent + tenant memory are on the
  roadmap. Tab label, hub chip, turn author all rebranded.
- src/scenes/GeoAttendance.tsx: scene re-titled to 'Attendance map ·
  preview' with honest copy explaining the dataset is illustrative until
  the EA2 attendance feed is wired in.
- src/data/synthetic.ts: orphaned from runtime (kept in tree for tests).
  Snapshot now sources only the live-cached EA2 read (scenarios.json),
  filtered through the same curator.

29/29 tests green. No more 'rv test flow 0' / 'orphan' / 'Atlas F1' / raw
32-char hex IDs visible to a buyer.

src/scenes/Wizard.tsx

@@ -403,7 +403,7 @@ export default function Wizard() {
              <div className="wizard-panel success-panel">
                 <div className="success-icon"><Check size={32} /></div>
                 <h3 className="panel-h">Process Published!</h3>
-                <p>Process definition <code>{publishedKey}</code> is now active in EA2.</p>
+                <p>Your process <strong>{draft.name || "Untitled"}</strong> is now active and ready to run.</p>
                 <div className="actions-row">
                      <button className="btn btn-secondary" onClick={() => { setDraft({ step: "Intake", name: "", description: "", nodes: [], edges: [], fields: [], rules: [] }); setPublishedKey(null); }}>Create Another</button>
                      <button