fix: address automated release and spec drift queue

[avifenesh]

Summary

• enforce the Agent Skills specification's string-to-string metadata map and refresh the Agent Skills baseline
• add CC-SET-021 for ignored project-level remoteControlAtStartup: true in Claude Code 2.1.222+
• review and refresh the Cursor environment/spec baseline and release marker
• review Cline v4.1.4 as having no changes to validated .clinerules, workflow, hook, or skill surfaces
• regenerate rule docs and bookkeeping for 445 rules

Addresses #1316, #1317, #1318, and #1319.

Validation

• cargo test --workspace
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo fmt --all -- --check
• cargo test -p agnix-cli --test kiro_ci_gate -- --include-ignored
• node scripts/sync-rule-bookkeeping.js --check
• git diff --check
• live scripts/check-tool-releases.sh sweep: all baselines current after Cline v4.1.4 update

[revuto-review]

This is an auto review done by revuto.

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The core validator changes are directionally sound, but this reviewed head leaves three repository invariants/checks broken: changelog coverage for release baselines, locale synchronization, and the repository's own self-lint.