ci(cloudflare): fail a pull request whose vertical has no stage edge placement

[BleedingDev]

Why the change

A vertical merged without its Cloudflare placement (as #889 Inventory did) only failed the stage edge deploy after merge, so this moves the check onto every pull request.

Special things to note

• The check runs inside the existing Repository Tooling Tests job and needs no secrets, so fork PRs get it too. The secret-gated Check the Cloudflare edge deploy configuration job is unchanged.
• The CPU tier can't be missing: createModernConfig defaults every vertical to CLOUDFLARE_WORKER_CPU_MS.vertical, so the docs checklist covers picking it instead of a check.
• The three shared build-variable names moved from the cut-over script into stage-edge-units.mts so both use one list.

Change outline

 scripts/ops/stage-edge-units.mts
+  placementGaps(topology, placement) -> string[]
+    "units: <id>"                       topology unit not placed
+    "buildEnvironment.<KEY>"            MF_DEV_ORIGIN / HYPERDRIVE_ID / SPICEDB_VPC_SERVICE_ID
+                                        or a placed unit's ULTRAMODERN_PUBLIC_URL_<UNIT> unset
 scripts/tests/cloudflare-stage-cutover.test.mts
+  real topology + placement -> []       (fails any PR that adds a vertical without placement)
+  fixture missing catalog/pricing/hyperdrive -> names all three
 docs/architecture/DEPLOYMENT.md
+  ### Adding a vertical: topology block, placement unit, public URL, CPU tier, worker-secrets

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
app/docs/architecture/DEPLOYMENT.md	Unsupported file format
app/scripts/ops/cloudflare-stage-cutover.mts	0% smaller
app/scripts/ops/stage-edge-units.mts	0% smaller
app/scripts/tests/cloudflare-stage-cutover.test.mts	0% smaller

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📥 Commits

Reviewing files that changed from the base of the PR and between 7e18af0 and ea5a66e.

📒 Files selected for processing (4)

• app/docs/architecture/DEPLOYMENT.md
• app/scripts/ops/cloudflare-stage-cutover.mts
• app/scripts/ops/stage-edge-units.mts
• app/scripts/tests/cloudflare-stage-cutover.test.mts

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