NP-790: Fix bundled action runtime preset loading + add e2e smoke test

[illiaizotov-dev]

Summary

Fixes a runtime crash consumers hit when using StackAdapt/github-tag-action@v7:

Error: TypeError [ERR_INVALID_ARG_TYPE]: The "paths[0]" argument must be of type string. Received undefined
    at resolve (node:path:1257:7)
    at resolveToFileURL (lib/main.js:41844:25)
    at importFrom (lib/main.js:41888:30)
    at load_changelog_config_default (lib/main.js:43164:99)
    at async generateNotes (lib/main.js:43239:50)

Root cause

@semantic-release/release-notes-generator/lib/load-changelog-config.js resolves the preset option at runtime via import-from-esm. That helper walks the filesystem looking for conventional-changelog-<preset> in node_modules — a search that fundamentally cannot succeed in the bundled Action runtime because GitHub Actions does not run npm install on the action dir, and our esbuild bundle is a single self-contained file. The upstream silent-then-fallthrough code path ends up calling path.resolve(undefined, ...) when the context's cwd is unset, which is how the confusing ERR_INVALID_ARG_TYPE surfaces.

Fix

• Statically import conventional-changelog-conventionalcommits in src/action.ts so esbuild inlines it.
• Call the preset factory ourselves and hand the resolved parser / writer options to generateNotes as parserOpts / writerOpts. With no preset / config supplied, load-changelog-config.js takes its safe conventional-changelog-angular fallback (also statically imported upstream and therefore bundled) and shallow-merges our options on top — conventionalcommits' keys win.
• Pass cwd: process.cwd() on the context as belt-and-suspenders.

Integration test that would have caught this

tests/bundle.smoke.test.ts gains a third test case that runs the shipping bundle end-to-end:

• Spins up a local node:http mock server for /repos/foo/bar/tags and /repos/foo/bar/compare/....
• Copies lib/main.js into os.tmpdir() (no sibling node_modules anywhere on the resolver walk).
• Spawns it with GITHUB_API_URL pointed at the mock and INPUT_DRY_RUN=true so it exits cleanly after changelog generation.
• Asserts no ERR_INVALID_ARG_TYPE / paths\[0\] / module-resolution errors, and positively asserts on Dry run: not performing tag action. to confirm execution walked past generateNotes.

Uses async spawn + Promise-based capture (not spawnSync) because the bundle emits enough startup stdio to deadlock spawnSync on macOS with captured pipes.

Reviewer-hardening follow-up

• runChildAndCapture listens for child error so a failed spawn surfaces the error through captured stderr rather than hanging until the SIGKILL timer.
• Mock HTTP server's listen promise attaches a one-shot error handler so bind failures (EADDRINUSE on CI) reject cleanly instead of wedging the test until Vitest's timeout.
• Documented in src/action.ts that commitOpts always comes from angular when no preset / config is passed — harmless today (defaults match) but flagged for future upstream drift.

Test plan

• npm run build — bundle produces a 1.7 MB self-contained lib/main.js
• npm test — 37 tests pass across 5 files
• npm run lint — clean
• npm run check — Prettier clean
• npm run typecheck — clean
• Against the previously-shipped (buggy) bundle the new smoke test reproduces the user-reported error line-for-line and fails; after the fix it passes
• Green CI on this PR
• After merge: move the floating v7 tag to the merged commit so consumers pick up the fix

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