cowork: schema command error-path hardening + honest sample footer

[Coding-Dev-Tools]

Harden the schema subcommand (silent-failure class): unsupported --format and malformed input now exit cleanly with a red ERROR message instead of an unhandled traceback. Fix misleading 'Inferred from N+ rows' footer to 'up to N rows' (honest claim). Adds 3 CLI error-path tests (144 total pass, ruff clean). Branch also carries a merge of origin/master resolving the pyproject self-referential extra conflict in favor of the corrected datamorph-cli name.

[github-actions]

🤖 Automated Code Review

✅ Ruff Lint — No issues

⚠️ Ruff Format — Formatting needed

unformatted: File would be reformatted
  --> README.md:28:1
   |
27 | import pandas as pd
   - df = pd.read_csv('huge_file.csv')  # OOM on 5GB+
   - df.to_parquet('output.parquet')
28 +
29 + df = pd.read_csv("huge_file.csv")  # OOM on 5GB+
30 + df.to_parquet("output.parquet")
31 | ```
   |

unformatted: File would be reformatted
 --> conftest.py:2:1
  |
1 | """pytest configuration — add project src to Python path and skip rate limits."""
2 +
3 | import os
  |

unformatted: File would be reformatted
   --> src/datamorph/cli.py:103:15
    |
102 | @click.option("--pattern", default="*", help="File glob pattern (default: all files)")
    - @click.option(
    -     "--recursive", "-r", is_flag=True, help="Search subdirectories recursively"
    - )
103 + @click.option("--recursive", "-r", is_flag=True, help="Search subdirectories recursively")
104 | @click.option("--csv-delimiter", default=",", help="CSV delimiter")
--------------------------------------------------------------------------------

✅ Secret Detection — Clean

✅ Large Files — Within limits

📊 Diff Stats — 2 file(s) changed

 src/datamorph/cli.py          | 16 +++++++++++++---
 tests/test_cli_error_paths.py | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 3 deletions(-)

---

Verdict: ⚠️ Warnings — Lint/format issues found. Recommend fixing before merge.

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