docs(#12844): add cloud routing tail headers

[lalalune]

Summary

• add required prose headers to the five packages/cloud/routing/src TypeScript source files called out by the B07-D tail audit
• convert the docs redirect Worker's line-comment opener to the required top /** ... */ prose header
• add the missing deterministic harness header to the docs redirect Worker test

Refs #12844.

Verification

• PASS: bun run check:comment-only (7 source file(s) changed; every code token identical to origin/develop)
• PASS: bunx @biomejs/biome check packages/cloud/routing/src/features.ts packages/cloud/routing/src/index.ts packages/cloud/routing/src/resolve.test.ts packages/cloud/routing/src/resolve.ts packages/cloud/routing/src/types.ts packages/cloud/docs-redirect/src/worker.test.ts packages/cloud/docs-redirect/src/worker.ts
• PASS: bun run --cwd packages/cloud/routing test (1 file / 61 tests)
• PASS: bun run --cwd packages/cloud/docs-redirect test (1 file / 6 tests)
• PASS: git diff --check origin/develop...HEAD

Verify limitation

• bun run verify was attempted twice during the surrounding comment-only sweep and failed outside this change at @elizaos/cloud-shared:typecheck: missing declarations for drizzle-orm* resolved through dist/node_modules, followed by implicit-any errors in plugins/plugin-sql/src/schema/*. This branch is comment-only and the scoped verifier proves zero functional token changes.

Evidence

• N/A - trajectories/screenshots/video/audio/domain artifacts: comments-only change, zero functional diff machine-checked by scripts/assert-comment-only-diff.mjs.

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[lalalune]

Local validation pass from an isolated checkout at /tmp/eliza-pr-12912.

Commands run:

git remote set-url origin https://github.com/elizaOS/eliza.git
git fetch origin develop
bun run check:comment-only
bunx @biomejs/biome check packages/cloud/routing/src/features.ts packages/cloud/routing/src/index.ts packages/cloud/routing/src/resolve.test.ts packages/cloud/routing/src/resolve.ts packages/cloud/routing/src/types.ts packages/cloud/docs-redirect/src/worker.test.ts packages/cloud/docs-redirect/src/worker.ts
bun run --cwd packages/cloud/routing test
bun run --cwd packages/cloud/docs-redirect test
git diff --check origin/develop..HEAD

Result: all passed. check:comment-only reported 7 source files changed with code tokens identical to origin/develop; routing tests passed 61 tests and docs-redirect tests passed 6 tests.

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