Fix analyze mode enum ambiguity, normalize v1.1.0 invalid fixtures, and update checksum default

[GsCommand]

Motivation

• The analyze request schema exposed canonical verb names in the mode enum (e.g., classify) which creates semantic ambiguity between analysis style and verb delegation.
• Many v1.1.0 invalid fixtures were copy-pasted and contained multiple simultaneous failures or wrong verb literals, reducing the suite's usefulness for targeted validation.
• The generate-checksums.sh no-argument default used a stale schemas/v1.0.0 path, which silently limited checksum scope and diverged from the repo’s authoritative schemas/ layout.

Description

• Replaced the verb-name classify mode with a non-ambiguous categorize value in schemas/v1.1.0/commons/analyze/analyze.request.schema.json and clarified the mode description to explain when to use dedicated verbs.
• Updated TypeScript example surface to match the new enum (e.g., examples/v1.1.0/commons/analyze/ts/valid/analyze.request.valid.1.ts now uses "categorize").
• Normalized the v1.1.0 invalid TypeScript request/receipt fixtures so each file now preserves the correct verb and isolates a single primary failure reason (many examples/v1.1.0/commons/*/ts/invalid/*.ts files updated).
• Added one focused invalid JSON receipt to expand coverage for missing required top-level fields: examples/v1.1.0/commons/classify/json/invalid/902-missing-signature.receipt.invalid.json.
• Changed scripts/generate-checksums.sh default root from schemas/v1.0.0 to schemas, added a short usage/help line, and regenerated checksums.txt to reflect the updated scope; explicit-argument behavior is preserved and package.json script still invokes bash scripts/generate-checksums.sh schemas checksums.txt.
• Total touched files: 43 (schema, checksum script/output, updated TS invalid/valid examples, and one new invalid JSON fixture).

Testing

• Ran node scripts/validate-all.mjs to compile schemas, which completed successfully.
• Ran node scripts/validate-examples.mjs to validate example valid/invalid request and receipt fixtures, and all validations completed successfully with invalid fixtures still rejected and valid fixtures accepted.
• Regenerated checksums with bash scripts/generate-checksums.sh schemas checksums.txt and verified the output updated checksums.txt as expected.
• Verified no-arg invocation bash scripts/generate-checksums.sh now defaults to schemas and succeeds, and git diff --check returned no issues.

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Codex Task