Exclude synced static/api*.json from whitespace pre-commit hooks

[matthewhelmke]

Problem

The AutoDocs PR #3626 failed the required pre-commit check — a job that has always passed. The failing hook is end-of-file-fixer, on four files:

static/api.json
static/api-v1.json
static/api-v2alpha1.json
static/api-v2beta1.json

These are OpenAPI specs that .github/actions/integrate-platform-docs syncs verbatim from cloud storage (gsutil ... enforce-openapi/api*.json static/), and the generator emits them without a trailing newline. They've always lacked one; prior AutoDocs runs simply didn't change them, so they stayed out of the pre-commit diff. This run updated the spec, pulling them into the changed-file set, and end-of-file-fixer rewrote them — failing the check on content the docs team can't hand-fix (the next sync clobbers any newline we add).

Fix

Exclude static/api*.json from trailing-whitespace and end-of-file-fixer, mirroring the existing chainctl-docs exclusion — same rationale: generated, synced verbatim, fixes don't survive the next sync. Each exclude becomes a verbose ((?x)) regex covering both paths.

Verification

• Regex tested against the four files plus near-misses (static/apidocs/x.json, static/api.json.bak) — matches only the intended specs, no over-match.
• pre-commit run end-of-file-fixer --files static/api*.json README.md now passes (the specs are skipped; normal files still checked).
• Config-only change; check-yaml and the full local hook suite pass.

Once this merges, the next AutoDocs run (or a rebase of #3626 onto updated main) will pass the check.

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Created in collaboration with Claude Code running Opus 4.8 on 2026-07-23.

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[matthewhelmke]

These files have always lacked a trailing newline and worked.
The linter just started checking for this and is failing them.
The fix is to exclude these files from the linter as was done earlier for the automated chainctl files.