[shipmill-romamo]

Summary

Bounds the last three unbounded pieces of model text in the investigation record, per D-8 as chosen on #63.

• finding.rootCause and finding.why keep at most 8000 characters (FINDING_TEXT_LIMIT), keeping the start before a [last N characters cut] mark through the existing _head_text (as D-6). The cut happens where _finding builds the Finding, so the proposed/unrecorded decision ids are still read from the whole proposed line
• _run_call refuses a call whose parsed arguments serialize to more than 8000 characters (STEP_ARGUMENTS_LIMIT, measured with json.dumps(arguments, ensure_ascii=False), so non-ASCII text counts in characters, not escapes). It is recorded as an invalid step with empty arguments, exactly like the non-JSON case; the tool does not run and the repeat cache is not filled. The model is told the arguments are too long and nothing ran
• The trace's raw toolCalls[].arguments still keeps the cut start of an oversize call (_call_text unchanged)
• Schema: maxLength: 8000 on finding.rootCause and finding.why, plus descriptions; steps[].arguments gets a description only (no schema rule can bound an object's serialized size, so code enforces it)
• To stay under ruff's return-count limit, the non-object and oversize checks moved into a small _arguments_problem helper

Tests

• Arguments at exactly 8000 serialized characters run and are kept whole; 8001 and 50000 are refused unrun with {} and invalid, the model is told why, and the trace keeps the marked start of the raw text. Saved records validate against the schema
• Non-ASCII arguments are measured in characters: 7999 Cyrillic characters run, 8001 are refused
• A repeated oversize call is refused again rather than served as repeated
• Finding lines at 8000 are kept whole; 8001 and 50000 keep the start with the mark (Cyrillic, counted in characters); records validate
• A decision id past 8000 characters in the proposed line is still found
• The schema accepts an 8000-character rootCause/why and refuses 8001
• uv run ruff check ., uv run mypy, uv run pytest (full suite, 496 passed), uv run cloudfall config validate --project config/examples all pass

Fixes #63

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