fix(perry): register PERRY_OBJECT_LITERAL_SHAPE_METHODS as a build-cache input

[proggeramlug]

codegen_env_vars_are_build_cache_inputs is red on main.

#9122 introduced PERRY_OBJECT_LITERAL_SHAPE_METHODS (a codegen kill switch) without registering it in BUILD_CACHE_ENV_VARS. I caught that during review and prepared the registration, but it did not make it into the commit that merged — my cherry-pick of the fix resolved against the wrong branch and silently no-op'd, so I merged #9122 without it. My mistake, not the PR author's.

these codegen env vars key neither the build cache nor an exclusion (#6394's rule):
["PERRY_OBJECT_LITERAL_SHAPE_METHODS"]

The knob selects between two different literal-birth emission sequences, so it is a genuine cache key rather than an exclusion candidate — a cached object built with it on must not serve a build with it off.

Verified on this branch: the gate test passes (1 passed), fmt clean.

Summary by CodeRabbit

• Bug Fixes
  • Prevented incompatible cached object results from being reused when object methods capture this.
  • Ensured build cache behavior remains consistent across different object-literal compilation settings.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d2b98068-117a-49d9-82f9-3cfeeed47f43

📥 Commits

Reviewing files that changed from the base of the PR and between 4994c77 and d203b40.

📒 Files selected for processing (1)

• crates/perry/src/commands/compile/build_cache.rs

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📝 Walkthrough

Walkthrough

The build cache now includes PERRY_OBJECT_LITERAL_SHAPE_METHODS as an environment input, preventing cache reuse across different object literal shape method settings.

Changes

Build cache invalidation

Layer / File(s)	Summary
Track object literal shape methods setting crates/perry/src/commands/compile/build_cache.rs	Adds PERRY_OBJECT_LITERAL_SHAPE_METHODS to BUILD_CACHE_ENV_VARS.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: jdalton

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/9122-register-literal-shape-knob

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