Prepare 1.7.0 release metadata

[mehul0810]

Refs #165

Summary

• bump release metadata from 1.6.0 to 1.7.0 in the plugin header, WordPress.org readme, package metadata, and package lockfile
• add a 1.7.0 changelog section limited to work already merged into release/1.7.0
• update the 1.7.0 FAQ and upgrade notice wording without including unspecced future milestone ideas

Base Branch

• base: release/1.7.0
• source branch: fix/165-release-1.7.0-metadata

Scope

• release metadata and docs only
• no implementation behavior changes
• no production/beta tag, release creation, WordPress.org publish, or production branch merge

Validation

• git diff --check passed
• php -l perform.php passed
• composer validate --no-check-publish passed
• composer lint passed
• composer phpstan passed
• npm run plugin-zip passed and produced a release ZIP with plugin files, built assets, and production vendor files

Known Proof Gaps

• composer check-cs currently fails on existing repository style findings outside this diff, including config/constants.php, JS config/test files, and module interface spacing. This PR does not touch those files.
• npm run lint is blocked in this local shell because Node is v16.15.1, while this repo requires Node 24 via .nvmrc and .node-version. CI or a local Node 24 environment should provide the authoritative JS lint proof.
• Plugin Check is not available as a repo-local command or workflow in this checkout.
• Browser proof remains CI/local-WP-env dependent; latest release-branch CI before this metadata patch had green Playwright smoke proof at 696e5ba.

Release Notes

• included dashboard overview, runtime diagnostics, page cache exclusion controls, Assets Manager reset action, sitemap preload traversal hardening, CDN module load gating, and metadata/readme wording refresh because those are already merged into release/1.7.0

Hard Gates

Final production or beta release actions still require explicit owner approval after the release-ready brief.

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