test(antigravity): realign mapping assertions with the pruned reference

[cwest]

This PR targets the dev branch.

Who is submitting this PR? (required)

Field	Value
Your model + version	Claude Opus 4.8 (claude-opus-4-8), via Google Vertex AI
Harness + version	An internal Google agent harness (not publicly named)
All plugins installed	None relevant to this change; the superpowers plugin was installed on the real Antigravity CLI (agy 1.1.1) for live verification
Human partner who reviewed this diff	Casey West (@cwest) — reviewed the complete diff and verified it end-to-end, including a live run on the real agy CLI

What problem are you trying to solve?

tests/antigravity/test-antigravity-tools.sh fails on dev:

$ bash tests/antigravity/test-antigravity-tools.sh
test-antigravity-tools: checking Antigravity tool mapping
FAIL: mapping does not document view_file as the file/skill-read tool   # exit 1

e7ddc25 (#1847) intentionally trimmed the skill-loading explainer and the generic action→tool table out of antigravity-tools.md (pruning to "the harness-specific notes that still carry weight"), but did not update tests/. The test still greps for tokens the prune removed — view_file, IsSkillFile, SKILL.md, run_command, grep_search — so the antigravity suite has been red ever since. The doc is correct as-is; the test is stale.

What does this PR change?

Realigns tests/antigravity/test-antigravity-tools.sh with the slimmed reference: it now asserts only what the doc still documents and agents rely on — subagent dispatch (invoke_subagent, self/research), the write_to_file/replace_file_content tools, and the task-artifact mechanism — plus the SKILL.md Platform Adaptation link. Drops the assertions for the intentionally-removed tokens. One file (test only); the reference doc is untouched.

Is this change appropriate for the core library?

Yes — it repairs an existing core test so the antigravity suite is green again. No new skill, domain, or third-party integration; no product behavior change.

What alternatives did you consider?

1. Restore the pruned content to antigravity-tools.md (turn the test green by re-adding view_file/IsSkillFile/etc.). Rejected: Prune per-harness tool-mapping boilerplate #1847 removed that content deliberately, and a clean agy run confirms agents don't need it (skills load and brainstorming auto-triggers without it). Re-adding it would reintroduce exactly what the prune set out to remove.
2. Realign the test with the slimmed doc (this PR). Chosen — it matches the intent of Prune per-harness tool-mapping boilerplate #1847 and keeps the doc lean.

Does this PR contain multiple unrelated changes?

No. Single file, single concern: make the stale antigravity test match the intentionally-pruned reference.

Existing PRs

• I have reviewed all open AND closed PRs for duplicates or prior art
• Related PRs: test: realign antigravity + pi mapping assertions with pruned references #1987 (open), Document Antigravity tool mappings for skill loading #1902 (closed)

#1987 (open) proposes the same realignment across two files (tests/antigravity + tests/pi). This PR is the narrower, antigravity-only version — happy to defer to #1987 if you'd rather take the combined change; flagging it so you can choose.

#1902 (closed) proposed the opposite fix (restoring the doc). Per the reasoning above, the doc-restore direction re-adds content #1847 intentionally removed, so this PR fixes the test instead.

Environment tested

Harness	Harness version	Model	Model version/ID
Antigravity CLI (agy)	1.1.1	Antigravity default (Gemini)	not surfaced by agy

Repo suite (no model): bash tests/antigravity/run-tests.sh → PASS; bash tests/hooks/test-session-start.sh → PASS; git diff --check → clean.

New harness support (required if this PR adds a new harness)

N/A — no new harness. As corroboration that the removed details aren't needed at runtime: on a clean, isolated agy 1.1.1 profile (agy plugin install <repo>) the plugin loaded 14 skills + the SessionStart hook, and a live session auto-triggered brainstorming before any code was written — without the pruned mapping lines present.

Evaluation

• Before: the antigravity suite fails on dev with the error above.
• After: bash tests/antigravity/run-tests.sh passes; the test still catches real regressions (removing invoke_subagent, the self/research types, or the task-artifact mechanism from the doc still fails it).
• A live agy run confirmed skills load/trigger without the removed tokens — i.e. the doc is correct as slimmed.

Rigor

• N/A — not a skills change (this is a test-harness assertion realignment)
• This change was tested adversarially, not just on the happy path (full antigravity suite + hooks test + whitespace check + live agy run; confirmed the trimmed test still fails when a still-documented token is removed)
• I did not modify carefully-tuned content (Red Flags table, rationalizations, "human partner" language)

Human review

• A human (Casey West, @cwest) has reviewed the COMPLETE proposed diff before submission

[cwest]

Closing in favor of #1987 — it makes the same test realignment and also covers
the pi test (this one was antigravity-only), so it's the more complete fix.
I verified it and left details over there.