chore(release): prepare v0.7.1 stable publication

[Eclipseic1848]

Summary

• Prepare the complete v0.7.1 version set: root, eight npm packages, Python SDK, bundled Worker, module contracts, and release metadata.
• Refresh current bilingual documentation, Skills, and examples after the review fixes in security: reject plaintext credentials in custom provider headers #159–docs(python): align PyPI maturity classifier with stable release #165. All 466 public Markdown/MDX files were audited; historical ADRs, specifications, and release evidence remain unchanged.
• Fix release preparation and strict Provider Artifact consumption, including selected-candidate SHA handling for documentation-only candidate reuse and final Runtime/Worker/npm digest checks.
• Preserve the v0.7.0-only network waiver boundary. Public availability is not claimed until the live Release and registry channels exist.

Validation

• npm run build:python-worker: passed.
• npm run check: passed (320 Biome files, TypeScript checks, 22 module contracts, five golden examples, 14 bilingual documentation pairs, 466 Markdown/MDX files).
• Release/version/workflow/Provider-artifact regression tests: 4 files, 29 cases passed.
• Python SDK tests with repository PYTHONPATH: 29 passed; Python golden example tests: 2 passed.
• npm run docs:build: passed; existing bundle-size warning only.
• npm run security:audit: passed; production dependencies have no known vulnerabilities, existing development-only risks remain recorded through 2026-09-30.
• Standards and Spec independent review: PASS after fixing all findings.
• git diff --check: passed.

Release boundary

This PR does not publish packages or create a tag. After both required Engineering checks pass and this PR is merged, the v0.7.1 candidate and publication workflows will run against the exact protected-main commit. GitHub Release, npm, and PyPI publication are explicitly authorized by the maintainer.

CI regression follow-up

• Initial Ubuntu and Windows runs exposed the same historical v0.7.0 waiver fixture version drift after the version bump.
• Fixed only the test fixture (10 lines); explicitly verifies that the same waiver and Runtime digest are rejected for v0.7.1. No production behavior changed.
• Red/green reproduction, 12 targeted tests, Biome, diff checks and independent Spec review passed. Current head: 7dfd311; Engineering run: 33791152826.