[willtheorangeguy]

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Brings Running-Calculator in line with the Wave 2 documentation contract.

README — rewritten to the house template. The credits table is unchanged.

docs/ — README.md (index), quickstart.md, installation.md, units.md (renamed from UNITS.md), architecture.md, development.md, faq.md, troubleshooting.md, roadmap.md, and internal/known-issues.md. Removed docs/USAGE.md (folded into quickstart) and the unused docs/images/.

Findings — three, recorded in docs/internal/known-issues.md and not fixed:

• A total time of zero divides by zero and exits with a traceback (Medium). Verified by running it; the prompts invite the input that causes it.
• Three of the six conversions in the in-program unit list are wrong (Medium). The constants are correct, so results are unaffected — only the printed reference has drifted.
• The in-program licence notice says 2022-2023 while the file header says 2022-2026 (Low).
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