[Birfy]

Closes #874

An unknown algorithm name that is a close typo of exactly one registered card (difflib, cutoff 0.75 on the case/hyphen-folded name) now ends with ; did you mean 'gepa'?. Unrelated names (nope) get no guess; the examples-only port tip (#801) is unchanged and takes precedence. The message prefix is unchanged, so existing matches on unknown algorithm 'x'; available: [...] still hold.

Covers algorithms show / run, spec algorithm fields and MCP, since they all go through algorithms.get.

Tests: new parametrised cases in tests/test_algorithms.py; algorithm/run/demo/MCP/tournament suites pass locally.

[Birfy]

Review at 8d508f3d53f70afb57726277059db5b49ea77f18

Verdict: PASS

• Suggestion only fires for a close match (cutoff 0.75) to the folded name; nope gets none, and the algorithms show/run: naming an examples/ research port (reflexion, textgrad, …) only lists registered cards #801 examples-only port tip still wins.
• Message prefix unchanged, so existing regex/substring assertions and callers stay valid; it's appended after the (see …) hint.
• difflib is stdlib; import is local to the error path.
• Tests: near-miss and no-guess cases added; algorithm, run, demo, MCP, tournament suites pass locally.

risk_gate: T2 (23 lines / 3 files).