FOLLOW-UP: Per-page read cache in include.Preprocess (from PR #256)

[adnaan]

Context

PR #256's include.Preprocess reads files via readFileBounded for each include block.

Source PR: #256
Suggested by: @claude[bot]
Comment type: PR review (round 3)

Task Description

Two include=\"./same.go\" blocks within the same page (e.g., showing different ranges of the same file) cause two os.ReadFile calls. Acceptable for v1 page sizes; an in-render-pass cache would be a small optimization if large pages with many same-file slices become common.

Implementation: a small map[string][]byte scoped to a single Preprocess call.

Original Comment

No caching of repeated includes within a page: two include=\"./same.go\" blocks cause two os.ReadFile calls. Acceptable now, but a single-page read-cache in Preprocess would be a small optimization if large pages become common.
— @claude[bot], round 3

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