feat(runner): add content addressable delta shipping support

[Atchyut Preetham Pulavarthi (theonly1me)]

Overview of Changes

runner.runFlow takes an unchangedFiles map so a run can send only what moved since the last one, and the CLI sent the whole file set every time. Iterating on one flow therefore re-uploaded its entire import graph on every run.

• Send unchangedFiles for the files whose content matches what this runner was last sent, and the rest in full
• Keep the entry point and package.json in full every time, since the server reads an execution target from one and dependencies from the other and neither can come from a hash
• Record the baseline in .qawolf/runner-files.json, a sibling of runner.json so a runner terminate cannot take it along
• Write it with the temp-and-rename runnerStore uses, so two runs in one directory cannot leave half a file
• Write it only after a successful submission, since a lost answer may or may not have reached the pod
• Hash file content the same way the server does, so both sides agree on what changed
• Ignore a baseline belonging to another runner, and skip it entirely for a runner this invocation just launched
• Treat an unparseable baseline as absent, because falling back to the whole set is always correct
• Resend everything once when the runner does not hold what was claimed, and report rather than loop if that is refused too
• Report which way the files went as fileSync on the JSON output, and on stderr when following
• Move the submission out of runFlow.ts into submitRun.ts and sendRunFlowRequest.ts, with no change to what it does
• Document the delta in references/runner.md
• Cover the hashing, the always-sent files, every invalidation signal, both sides of the retry bound, and that a failed submission claims no baseline

Testing

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

bun test gives 1810 pass 0 fail, 16 of them new. The other five give exit 0.

• Added lines, excluding bun.lock and snapshots: 650, past the 600 error threshold in scripts/check-pr-size.sh. 277 are tests and 193 are the submission moving out of runFlow.ts, which was at the 150-line file cap.

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