chore(docs): sphinx toctree audit

[hkimw]

Summary

• Audited the resolved Sphinx toctree graph for both EN and KO builds.
• Found 0 unsuppressed pages missing from a toctree in both language builds.
• Made no file moves and no documentation content changes; this branch contains an empty audit commit only.

Findings

Build	Sphinx docs found	Reachable from index toctrees	Unsuppressed orphan pages
EN	91	89	0
KO	90	89	0

Intentional orphan pages observed:

• EN not reachable by toctree but explicitly marked orphan: docs/releases/v0.1.0-alpha, plots/GALLERY_HEADER.
• KO not reachable by toctree but explicitly marked orphan: docs/releases/v0.1.0-alpha.
• 404 is explicitly marked orphan in both builds.
• auto_plots/index is explicitly marked orphan but still reachable through docs/samples/index in both builds.

Sphinx build logs contained no document isn't included in any toctree warnings. Existing OpenGraph social-card font glyph UserWarning messages appeared during page writing, but they are unrelated to toctree reachability and did not fail strict mode.

Verification

• PATH="$PWD/.venv/bin:$PATH" PY="$PWD/.venv/bin/python" make strict passed for EN and KO.
• Cross-check used the generated Sphinx environment pickles from EN and KO builds, comparing env.found_docs against the closure of env.toctree_includes from master_doc, excluding documents with explicit orphan metadata.

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