[webfansplz]

Summary

When a plugin's transform returns code identical to its input (e.g. return code or return { code }), the inspect store wrote a second full copy of that code to the payload archive. This PR reuses the existing payload instead.

Changes

• In writeDataBatch, track the latest code queued for each module in the batch. If a step's result equals that code, point the step at the same payload index instead of pushing a new value.
• Reset the tracking whenever a new source or load result starts a module's snapshot, so steps never share a payload across transform requests.
• Sharing is safe for reclaim: ranges are released per module, and collectPayloadRanges already dedupes them.

Results from a hook that returns undefined were already skipped, so this only affects the identical-string case. Dedupe is scoped to a single write batch on purpose. Holding each module's latest code across batches would keep it in memory, which the store is designed to avoid.

Impact

Measured locally with a synthetic project (5,000 modules × 200 lines, 20 plugins, 5 of which return their input unchanged), median of 10 runs:

	Before	After
Payload archive	688 MB	459 MB (−33%)
Flush after transforms	626 ms	461 ms (−26%)
Transform time	862 ms	870 ms (within noise)

The savings scale with how many plugins return their input unchanged.

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commit: 1091539