Update changelog for 17.0.0.rc.7

[justin808]

Summary

Stamps the 17.0.0.rc.7 changelog header and adds the user-visible entries merged into release/17.0.0 since v17.0.0.rc.6 that were not yet reflected in CHANGELOG.md:

• Fixed: OSS renders no longer compute/emit Pro-only generated-stylesheet metadata (Skip generated stylesheet metadata for OSS renders #4395)
• Fixed: create_render_options no longer mutates the caller's options hash (Avoid mutating render option inputs #4396)
• Fixed: locale-file regeneration check no longer reads the whole file and correctly detects a legacy import after custom content (Avoid full locale default obsolete scans #4398)
• Changed: [Pro] removed unused addressable/rainbow runtime gem dependencies ([Pro] Remove unused addressable and rainbow runtime deps from gemspec (#4416) #4422)
• Fixed: [Pro] static RSC payload script stripping is robust to generated body-shape changes (Stabilize Pro RSC payload script stripping #4477)
• Updated the existing create-react-on-rails-app chalk→picocolors entry to also credit the color-fallback-parity follow-up (Match create-app color fallback to chalk #4473)
• Updated the existing Pro-by-default create-react-on-rails-app entry to also credit the matching prompts.yml AI-agent prompt update (Align create-app AI prompt with Pro default #4232)

Ran the classification-sweep helper over v17.0.0.rc.6..origin/release/17.0.0 (175 merged PRs, no UNKNOWN rows) and cross-checked every PR number against the current changelog to find the gaps above; everything else in range was either already documented or is internal/docs/CI/release-process and intentionally excluded per the changelog policy.

Test plan

• bundle exec rake "update_changelog[rc]" computed and stamped 17.0.0.rc.7 from git tags, updated compare links
• Verified [unreleased] and [17.0.0.rc.7] compare links anchor correctly
• Verified CHANGELOG.md ends with a trailing newline
• Pre-commit/pre-push hooks (prettier, trailing-newlines, markdown-links) passed

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[greptile-apps]

Greptile Summary

This PR updates the changelog for the 17.0.0.rc.7 release candidate.

• Adds the 17.0.0.rc.7 release heading.
• Updates the Unreleased and RC compare links.
• Adds user-visible Fixed and Changed entries.
• Expands two existing RC entries with follow-up PR references.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed changelog content.
• The new release heading and compare links match the existing release-candidate pattern.

Important Files Changed

Filename	Overview
CHANGELOG.md	Updates the release-candidate changelog section and compare links with no actionable issues found.

_{Reviews (1): Last reviewed commit: "Update changelog for 17.0.0.rc.7" | Re-trigger Greptile}

[claude]

Reviewed. This is a mechanical changelog-stamping PR (CHANGELOG.md only, no source changes). Spot-checked the additions and everything lines up:

• Version header placement: ### [17.0.0.rc.7] - 2026-07-06 inserted right after ### [Unreleased], matching the pattern the update_changelog rake task produces (rakelib/update_changelog.rake's insert_version_header), and consistent with how prior RC headers were stamped.
• Compare links: [unreleased] now points v17.0.0.rc.7...main and the new [17.0.0.rc.7] link correctly compares v17.0.0.rc.6...v17.0.0.rc.7.
• New entries verified against GitHub: PR 4395, 4396, 4398, 4422, and 4477 are all merged to main with dates between 2026-07-02 and 2026-07-05 (before the rc.7 stamp date), and each entry's description matches the actual PR title/intent.
• Updated existing entries (chalk→picocolors fallback parity crediting PR 4473, and the Pro-by-default entry crediting PR 4232 for the prompts.yml update) also check out against the linked PRs.
• Section placement is correct: the addressable/rainbow entry is under #### Changed and the other four new entries are under #### Fixed, matching the PR description's classification.
• File ends with a trailing newline, no stray whitespace.

No issues found — looks safe to merge.