docs: re-derive the Support Desk clean-run stats from one real run

[os-steve]

Fixes#9152

Both pages printed a stats line no run can emit. The card diagnosed it as "6 should be 4"; measuring says the opposite half is wrong.

What was measured

The CLI built at origin/main, driving a project scaffolded exactly as step 1 of build-with-claude-code.mdx describes (create-objectstack, blank template, name support-desk) with the page's own listings applied:

 ✓ Validation passed (103ms)
Support Desk v0.1.0
Minimal ObjectStack environment — a clean slate for building.
Data: 2 Objects 6 Fields
UI: 1 Apps 1 Views 1 Actions
Runtime: 3 plugins

6 Fields is correct and always was: 2 fields from the starter note object the blank template scaffolds (title, body) plus 4 from the page's ticket. The wrong number is 1 Objects.

The old line spliced two different projects together. Both were run:

project	emits
page followed literally — starter note kept	2 Objects 6 Fields
starter note deleted	1 Objects 4 Fields

1 Objects 6 Fields is the object count of the second and the field count of the first. That is why it was not reconstructible, and why correcting only the field count (as the card proposed) would have left the block just as unreachable.

stats.fields is a plain count — collectMetadataStats in packages/cli/src/utils/format.ts sums Object.keys(obj.fields).length over configured objects, injecting nothing.

What changed

Both clean-run blocks now carry the same run's output:

• Data: 1 Objects is now Data: 2 Objects.
• The Runtime: 3 plugins line is restored — the blank template ships ConnectorRestPlugin, ConnectorOpenApiPlugin and ConnectorMcpPlugin, so every scaffolded project emits it. The card's second finding, confirmed.
• The manifest description line under the banner is restored, for the same reason: the program prints it, and a transcript that drops a printed line is the defect this card is about.

And the run is now reconstructible from the page, which it previously was not:

• The Support-nav app listing is added. Step 2's prompt asks for "an app with a Support nav group" and step 5 tells the reader to open it, but no listing ever showed it — so 1 Apps was as unreachable as the field count. This is the card's own "fully specified on the page" route.
• The starter note object is named, with a line saying the counts include it and what they become if you delete it (measured, not assumed).

Scope notes

• No product surface was invented. No fields were added to reach 6; the two extra fields were already on disk in every scaffolded project.
• Timings are untouched. A duration is machine identity, not fixture identity, and docs: re-derive the os compile / os validate transcripts from real runs #9151 set that precedent one line up. The lines that are fixture identity now agree across both pages.
• The "verbatim" cross-reference is intact.validating-metadata.mdx sends readers to the bare-reference example on the other page; that block is byte-identical to origin/main (sha256 compared, both sides).
• Docs-only, so skip-changeset.

Verification

Gates re-derived from the actual changed paths via node scripts/pm/dispatch-gates.mjs, which named four beyond the dispatch list (the spec-liveness-check.yml family, triggered by content/docs/**). All run on 4b8ff84c6, a clean tree:

pnpm check:docs-audit-scope OK (178 hand-written docs in sync)
pnpm check:docs-redirects OK (92 entries, 98 chain probes)
pnpm check:role-word OK (43 baselined files, no new occurrences)
pnpm check:nul-bytes OK (6054 files, no raw control bytes)
pnpm --filter @objectstack/spec check:empty-state OK (all classified)
pnpm --filter @objectstack/spec check:liveness OK (30 governed types)
pnpm --filter @objectstack/spec check:strictness-ledger OK (61 files, 5 directories)
pnpm --filter @objectstack/spec check:variant-docs OK (18 unions, 8 governed)

The load-bearing check is not a gate: the fixture was rebuilt a second time from the updated page's four listings and re-run, reproducing the transcript above line for line. The page now reconstructs its own output.

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