Add built-in Clarity, Texture, and Contrast Dehaze approximation nodes

[JPPhoto]

Add Clarity, Texture, and Contrast Dehaze approximation invocations with shared numerical primitives, schemas, tests, and docs.

Summary

Adds Clarity, Texture, and Contrast Dehaze approximation as first-party built-in InvokeAI invocations. Includes shared TypeScript numerical primitives and fixtures, generated API schemas, tests, and user and provenance documentation. DCP is excluded; Contrast Dehaze is labeled as an approximation, with no qualified patent clearance obtained.

Related Issues / Discussions

#9813

QA Instructions

• Focused Python suite: 103 passed. Ruff 0.11.13 check/format and git diff --check passed. Pinned Ruff 0.11.2 was unavailable.
• pnpm -C invokeai/frontend/webv2 check:release passed all stages. Node 22.23.3 was used; pinned Node 22.14.0 was unavailable.
• pnpm -C docs test passed (1 test); pnpm -C docs check-redirects passed (88 redirects); docs build passed (353 pages, internal links valid).
• Playwright workflow check: chained all three nodes with a 96x64 RGBA image; queue reported Done 1 / Failed 0, each output was 96x64, and no browser or HTTP errors occurred.
• CPU-only 24 MP, one-thread measurements: image restore peak RSS changed from about 6.6 GiB to 2.37 GiB and time from 12.7-12.9 s to 3.0-3.1 s. Full effects changed from 6.8-7.1 GiB and 15.3-17.3 s to 2.37 GiB and 6.1-6.6 s.

Review

No material findings. Relevant checks passed.

Compatibility / Rollout

Adds new invocation schemas and generated OpenAPI and TypeScript artifacts. No persisted-workflow migration is needed for these additive nodes; schema discovery and connected graph execution were validated. DCP and its controls are excluded.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Meaningful regression coverage added / updated where needed; obsolete tests/code removed
• Persisted-state and API changes include required migrations / compatibility validation
• Relevant performance/efficiency opportunities considered; material claims have evidence
• Material review findings resolved and relevant checks rerun
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

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[JPPhoto]

@joshistoast I have some [untested] webv2 code in here too, feel free to build on this PR directly and then edit the summary to indicate that the issue should be closed.