refactor(runner): add the flow import resolver

[Atchyut Preetham Pulavarthi (theonly1me)]

Overview of Changes

qawolf runner run ships every shippable file under the working directory, so on a workspace where a flow reaches ten files it collects thousands and the request is refused on size before it ever runs. A socket run does not do this: it walks the flow's import graph. This ports that resolver so the CLI can do the same, as pure functions with no disk access; the walk that uses them is a separate change.

• Port parseTsconfigPaths and resolvePathAlias, honouring only the first target of the first matching pattern as the socket path does
• Port getImports, collecting top-level static imports and dynamic import() calls anywhere in the file, deduplicated
• Keep that walk's gaps, so export ... from and require() stay invisible and the CLI ships the same file set a socket run does
• Match on an alias prefix alone rather than a resolvable target, since a pattern naming no target still counts as an import to collect
• Port resolveImportPath, resolving an alias against the project root and a relative import against the importing file's directory
• Try .ts, .js, /index.ts then /index.js, never the bare path, and try the other supported extension when one is explicit
• Answer not-a-repository-import for a bare specifier and unresolved-repository-import for a relative or aliased import that matches nothing
• Resolve with node:path/posix, since collected paths always use forward slashes and backslashes would match nothing on Windows
• Take the TypeScript compiler as a parameter, so core/ stays free of I/O and nothing loads the compiler at runtime yet
• Cover every behaviour above, including the two gaps and the unreachable .tsx extension

Testing

bun run typecheck
bun run lint --max-warnings 0
bun run format:check
bun run knip
bun run test

bun test gives 1788 pass 0 fail, 31 of them new. The other five give exit 0.

• bun run build leaves dist/cli.js at 7.1 MB with no createSourceFile in it, confirming the type-only compiler import erases and nothing new is bundled.
• Added lines, excluding bun.lock and snapshots: 453, over the 400 warning threshold in scripts/check-pr-size.sh and under the 600 error threshold.

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