fix(SOL-424): stackone-defender-antigravity - accurate claims and Defender docs link

[faisalreza-stackone]

Summary

Audit of the stackone-defender-antigravity plugin, the Antigravity CLI build of stackone-defender. It gets the same fixes as the Claude Code build in #46, plus one versioning correction.

The two plugins intentionally share the skill name stackone-defender and are not installed together. This plugin is also intentionally absent from marketplace.json, since Antigravity does not install from the Claude Code marketplace.

Changes

• Skill version: metadata.version is bumped from 6.0 to 6.1, as the other skills do when they change.
• Skill history removed: the "What this changes from before" section described instructions the agent is no longer given. The hook's inlined SKILL_CONTRACT restates only the review rules, so it is unaffected.
• README, SFE: "Static Frequency Estimation preprocessing" is replaced with its real name, the Semantic Field Extractor, as described on the Defender docs page, which the README now links for how Tier 1, Tier 2 and the Semantic Field Extractor work.
• README, versioning: it said this plugin follows the marketplace's release-please lockstep version. It does not: release-please only bumps the Claude Code plugins, and this plugin's version is set by hand in plugin.json and package.json.

Not in this PR

• ML model fallback: the README's "falls back to a smaller MLP head" line is unchanged. It is tracked in ENG-2966 with the Claude Code build.
• @stackone/defender pin: this plugin pins ~0.7.0 while the Claude Code build pins 0.8.2. That is left to the owner of the Antigravity build.

Files

File	Change
plugins/security/stackone-defender-antigravity/skills/stackone-defender/SKILL.md	Bump metadata.version to 6.1, remove the history section
plugins/security/stackone-defender-antigravity/README.md	Defender docs link, Semantic Field Extractor, versioning

Test plan

• npm test in the plugin directory passes (12 of 12) after a fresh npm ci
• claude plugin validate . passes
• The README's "12 canonical inputs" matches this plugin's 12 fixtures, so it is unchanged

Closes SOL-424.

🤖 Generated with Claude Code

---

Summary by cubic

Fixes inaccurate claims and stale instructions in the stackone-defender-antigravity plugin so its docs match the real behavior.

• Removes metadata.version: "6.0" from the skill frontmatter, which matched neither this plugin's 2.5.0 nor anything else.
• Drops the "What this changes from before" section, which described instructions the agent is no longer given.
• Renames "Static Frequency Estimation preprocessing" to its real name, the Semantic Field Extractor (SFE), and links the Defender docs page that explains Tier 1, Tier 2, and SFE.
• Corrects the versioning claim: this plugin is versioned by hand in plugin.json and package.json, not by the marketplace's release-please lockstep, which only covers the Claude Code plugins.

^{Written for commit 669814e. Summary will update on new commits.}

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[cubic-dev-ai]

No issues found across 2 files

<sub>Auto-approved: Corrects the Antigravity plugin's README and skill doc: removes a mismatched skill version and stale history, fixes the SFE naming, and links the Defender docs. Docs-only change with no behavioral or config impact.

Re-trigger cubic</sub>

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

<sub>Auto-approved: Docs-only fix for the Antigravity Defender plugin: corrects SFE naming, links Defender docs, fixes versioning claims, bumps skill metadata version, removes stale history. No behavior or config changes.

Re-trigger cubic</sub>