fix(generator-cli): bump @fern-api/replay to 0.18.0

[devin-ai-integration]

Description

Bumps @fern-api/replay from 0.16.2 to 0.18.0 in generator-cli, pulling in the merged replay fixes from fern-replay#96 and fern-replay#97:

• Detection filters .fernignore-protected files before materializing patch content (commits touching only protected paths skip git format-patch entirely; mixed commits use a scoped git diff parent sha -- files)
• Trailing-slash gitignore-style patterns (docs/) now match — previously such entries were silently ignored
• Unhandled write EPIPE crash in GitClient.execWithInput fixed (git's exit code now decides the outcome)

This is what caused auth0/node-auth0 regenerations (13k typedoc files in docs/, listed in .fernignore as docs/) to churn for 25+ minutes and then crash.

Changes Made

• packages/generator-cli/package.json: @fern-api/replay 0.16.2 → 0.18.0 (+ lockfile)
• packages/generator-cli/versions.yml: 0.9.38 entry (rebased past 0.9.37 which landed on main in fix(generator-cli): allow AutoVersionStep to run without replay (non-replay mode) #16452; triggers generator-cli npm publish)
• packages/cli/cli/changes/unreleased/bump-replay-0.18.0.yml: CLI changelog entry (CLI bundles generator-cli for the local self-hosted GitHub path)
• Catalog pin in pnpm-workspace.yaml intentionally left at 0.9.35 — bumping it before 0.9.38 exists on npm breaks pnpm install (follow-up after publish, same as the 0.9.36/0.9.37 releases)
• Updated README.md generator (not applicable)

Testing

• Manual testing completed: rebuilt generator-cli locally with replay 0.18.0 and ran pipeline run against a real auth0/node-auth0 clone with fresh generated output. Before (0.16.2): ~4 min CPU churn then unhandled write EPIPE crash. After (0.18.0): pipeline succeeded in 12 seconds, 9 customer patches detected/applied, 0 conflicts, 13k docs/ files correctly excluded.
• Unit tests added/updated (replay fixes are unit-tested upstream in fern-replay)

Link to Devin session: https://app.devin.ai/sessions/ebae597e588c4fecb8f3802f05617c2a
Requested by: @tstanmay13

[devin-ai-integration]

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