Speed up latest site creation with a generated SQLite template

[chubes4]

Summary

• Generate a preinstalled SQLite database template from the bundled latest WordPress files during the CLI package flow.
• Use that template only for default latest site creation that starts immediately, falling back to the existing install path for missing templates, explicit WordPress versions, and --no-start.
• Validate the generated template before packaging so stale DB schemas fail early instead of shipping an upgrade-screen redirect.

Evidence

Check	Result
Default create-to-running	11252ms -> 6608ms (-4644ms, -41.3%)
Blueprint create-to-running	9519ms -> 8199ms (-1320ms)
Homeboy matrix assertions	46 passed, 0 failed
Missing template fallback	Passed locally
Explicit WP version fallback	--wp 6.8 created/started and reported 6.8.5
--no-start safety	Passed locally; no template DB is copied
Locale customization	sv produced WPLANG=sv_SE

Supporting rig PR: chubes4/homeboy-rigs#134

Studio issue: #3319

The same SQLite-template idea was also tested against Playground Web startup. It did not materially improve visible startup there (-1.34% for WP 6.8 and -5.61% for WP 6.4 in local traces), so this PR keeps the optimization Studio-owned and scoped to Studio's default latest create/start path.

Validation

• npm test -- apps/cli/commands/site/tests/create.test.ts
• npx eslint apps/cli/commands/site/create.ts apps/cli/commands/site/tests/create.test.ts scripts/generate-preinstalled-sqlite-template.ts
• npm run typecheck
• npm run cli:build && npm run cli:generate-preinstalled-sqlite-template
• homeboy trace using the Studio SQLite template comparison rig from Add Studio SQLite template comparison trace chubes4/homeboy-rigs#134

Note: npm -w wp-studio run package also passed locally and generated/validated the template. That command mutates the local dependency layout as part of existing install:bundle behavior, so I restored the workspace with npm install before running final typecheck.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafting the implementation and generator script, building the Homeboy evidence rig, running validation commands, and preparing the evidence summary. Chris directed the investigation and reviewed the conclusions.

[wpmobilebot]

📊 Performance Test Results

Comparing dfefdd6 vs trunk

app-size

Metric	trunk	dfefdd6	Diff	Change
App Size (Mac)	1409.62 MB	1410.00 MB	+0.38 MB	⚪ 0.0%

site-editor

Metric	trunk	dfefdd6	Diff	Change
load	1486 ms	1497 ms	+11 ms	⚪ 0.0%

site-startup

Metric	trunk	dfefdd6	Diff	Change
siteCreation	8587 ms	7570 ms	1017 ms	🟢 -11.8%
siteStartup	4923 ms	4923 ms	0 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)