docs: note drawImage keeps only the most recent scaled size per path

[dmccoystephenson]

Summary

Stage A documentation accuracy sweep (README, pyproject.toml, RELEASING.md, and in-code docstrings checked against source).

• One drift was found: drawImage's scaled-surface cache holds only the most recent (size, surface) pair per path (self._scaledImages[filePath] = (size, scaledImage)), which is already pinned by test_draw_image_rescales_when_size_changes. The docstring and the README described the scaled surface as simply "cached", so a consumer drawing one asset at two alternating sizes per frame would not expect a rescale on every call.
• The drawImage docstring and the README method list now state that behavior. No code or behavior was changed.

No tracking issue — gap found during triage.

Deferred issues

• release: version tags are pushed without the 'v' prefix publish.yml requires, so no release has ever been published #34 (release tag prefix) — touches .github/workflows/ and the release process; left for a maintainer decision.
• ci: test.yml's header comment claims it runs on every push, but pushes outside main are only covered via pull_request #39 (test.yml header comment) — workflow files are excluded from autonomous change.
• packaging: the empty preponderous/__init__.py ships a regular package, which will collide with any future preponderous.* distribution #40 (preponderous/__init__.py namespace package) — its prerequisite (the convention used by sibling preponderous.* projects) cannot be settled from this repository.

Test plan

• python3 -m py_compile src/main/python/preponderous/graphik/graphik.py
• python3 -m pytest — 53 passed (headless via conftest.py)

This PR description was drafted during a Gardener session (https://github.com/Stephenson-Software/gardener).

🤖 Generated with Claude Code

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drafted by Claude on behalf of Daniel Stephenson

[dmccoystephenson]

Self-review rubric (Copilot reviewer could not be added: Could not resolve user with login 'copilot', so this review was performed inline):

• Scope: PASS — only the drawImage docstring and the matching README bullet were changed; both describe the same cache behavior.
• Tests-new: PASS (n/a) — no public method was added.
• Tests-fix: PASS (n/a) — no behavior was changed; the documented behavior is already pinned by test_draw_image_rescales_when_size_changes and test_draw_image_scaled_cache_is_kept_per_path.
• Sibling structure: PASS — the new docstring paragraph follows the existing prose-then-Args layout of the neighboring draw methods.
• Sibling renames: PASS (n/a) — nothing was renamed.
• Docs: PASS — README and docstring now agree with self._scaledImages[filePath] = (size, scaledImage) in graphik.py; pyproject.toml and RELEASING.md were swept and no drift was found.
• Issue resolution: PASS (n/a) — no Closes #N; the gap was found during triage.
• Manual validation: PASS — py_compile succeeded, 53 tests passed locally, and all five Compile and test jobs (3.9–3.13) are green on the PR head.
• camelCase / Backward-compat / Headless / No new deps: PASS — no code, signature, test, or import was changed.
• Version sync: PASS (n/a) — _version.py was not touched.

Judgment call noted: the README bullet grows longer; a wording split was considered and rejected to keep one bullet per method, matching the drawButton entry.

No blocking findings.

This comment was drafted during a Gardener session (https://github.com/Stephenson-Software/gardener).

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drafted by Claude on behalf of Daniel Stephenson