ci(language-policy): DRY local Java/Kotlin check via estate reusable

[hyperpolymath]

Why

PR #105 added the android/** carve-out via two mechanisms:

• (a) Prune android/ from a local find step in .github/workflows/language-policy.yml
• (b) Add .hypatia-baseline.json with file_pattern: "android/**"

The estate-wide reusable at hyperpolymath/standards/.github/workflows/governance-reusable.yml (called from this repo's governance.yml) already reads .hypatia-baseline.json and exempts matched paths in its own language-policy job (see governance-reusable.yml:91-285).

(b) alone is sufficient. (a) is a duplicate that uses the brittle find mechanism the reusable explicitly warns against — git ls-files respects .gitignore correctly.

What this PR does

Removes the local Check for Java/Kotlin files step. The neurophone .hypatia-baseline.json carve-out continues to handle the android/** exemption via the estate-wide reusable.

Net behaviour change

Zero. The local check duplicated the estate check. Both gate on Java/Kotlin files; both exempt android/** via different mechanisms. Removing the local check means there's one mechanism instead of two, and the remaining mechanism is the auditable baseline file.

Properties preserved

• Kotlin (.kt, .kts) is still fully banned — by the estate-wide reusable's enforce "Java/Kotlin files" block.
• Non-Android Java (e.g. a stray Foo.java at repo root) is still blocked — same path.
• The android/** carve-out is still respected via .hypatia-baseline.json.

Stale-entry cleanup at end of migration

When the Gossamer migration completes and android/ is removed, the baseline entry will become stale. The reusable's Detect stale baseline entries job (governance-reusable.yml:127+) will warn. The entry can be removed in the same PR that deletes android/ (i.e. sub-PR #9 of the migration sequence in RFC PR #97).

Supersedes

• hyperpolymath/standards#341 (closed) — estate-wide grep change was redundant given the baseline mechanism already exists.
• hyperpolymath/neurophone#107 (closed) — same intent as this PR but pre-fix(cicd): carve out android/** from banned-language scan (Gossamer migration in flight) #105; rebase would have been a different change.

Test plan

• Workflow YAML is well-formed (visually verified).
• CI passes — local language-policy.yml runs without the Java/Kotlin step; estate-wide reusable runs and exempts android/** via baseline.
• Negative test: a hypothetical Foo.java at repo root would still trigger the estate-wide Language / package anti-pattern policy job (verified by inspection of governance-reusable.yml:345 + enforce() at line 310 + is_exempt() at line 292).

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