test(agy): [DO NOT MERGE] live-confirm the large-diff handoff

[doublegate]

Throwaway — do not merge. Adds a >125 KB fixture so the diff exceeds the reviewer's inline budget, forcing the on-disk file handoff. Purpose: confirm live (real workflow + runner + agy) that the absolute-path + --add-dir fix from #328 makes the large-diff handoff readable. Expect the agy review to actually read the diff (no "does not exist") and report no blocking issues. Closing + deleting the branch once confirmed.

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• tools/agy-selftest/large-diff-handoff-fixture.md

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• tools/agy-selftest/large-diff-handoff-fixture.md

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[github-actions]

Antigravity review (Gemini via Ultra)

This PR adds a 3,447-line Markdown test fixture (tools/agy-selftest/large-diff-handoff-fixture.md) containing repetitive filler text to test on-disk diff handoff handling for large PRs.

Blocking issues

None found.

Suggestions

• tools/agy-selftest/large-diff-handoff-fixture.md: L1-3454: Adding a ~230 KB static text file to the repository solely to inflate diff size increases repository bloat; consider generating large test inputs dynamically within the test runner instead of committing static filler.

Nitpicks

• The file header notes "Never merged"; ensure this PR is closed or cleaned up after testing to avoid accidentally checking in throwaway test artifacts.

_{Automated first-pass review by agy on a self-hosted runner -- not a human review.}

[doublegate]

Live confirmation succeeded. The agy review above read the full 229 KB diff from the on-disk handoff (it accurately summarized the 3,447-line fixture and its intent, and even quoted the in-file "Never merged" note) with no "does not exist" failure and no blocking issues — proving the absolute-path + --add-dir fix from #328 works end-to-end on the real workflow + self-hosted runner against a >125 KB diff. Closing as intended; this was a throwaway validation, never to be merged.