[AUTOMATED] fix(cli): decompile-rejects-subcommand-help — every subcommand answers -h/--help

[mahaloz]

Asking a command to describe itself is the first thing anyone does with an
unfamiliar CLI, and four of kuna's sixteen subcommands answered it with an
error. Two testers filed the same report against decompile; test, catalog
and specs sat one command away with the same defect.

$ kuna decompile --help
error: unknown option --help
$ echo $?
2

$ kuna decompile -h                 # -h does not start with `--`, so it was a positional
error: decompile requires <binary> and <func>
$ kuna catalog -h
error: unexpected argument "-h"
$ kuna specs --help                 # forwarded straight to slacomp
Unknown option: --help

The other twelve subcommands each print a usage block and exit 0.

The fix

• The -h | --help arm the twelve already had, added to the four that lacked it:
  decompile.rs, main.rs's cmd_test and cmd_catalog, and specs.rs ahead
  of the slacomp passthrough (slacomp owns no help flag, so the alias has to
  describe itself).
• Each prints its own multi-line block, not the one-line summary kuna --help
  already carried for it. The report asked to "discover decompile flags through
  subcommand help", and the one-liner names no --assert vocabulary, no
  --define-function contract and no --json shape.
• scripts/repipe/clitests.py now asks verify.vendorable() whether a promoted
  probe can run instead of re-deriving a stricter rule of its own. The two had
  disagreed, harmlessly until now: vendorable() admits a probe that needs no
  binary, clitests demanded target.binary_source == "in-repo" and refused one.
  kuna decompile --help is the first binary-less probe the corpus has held, so
  it failed make test-cli the moment it was promoted.

Tests

tests/cli/decompile-rejects-subcommand-help.json is the promoted acceptance
probe. decompiler/crates/kuna-cli/tests/subcommand_help.rs (5 tests) asserts the
contract over the whole dispatch table rather than the reported case — exit 0,
its own usage block, no binary and no .sla required, the repaired blocks naming
the flags that were being looked for, and an unknown option still exiting 2. Four
of the five fail without the fix; the fifth is the guard that the new arm did not
swallow a real usage error, and passes either way.

Gates: make test 675/675 PARITY OK · make test-stages 635/635 PARITY OK ·
make rust-test green · make check-spec OK · make test-cli 42/42 (41/42 with
the probe promoted and clitests unchanged) · kuna catalog --check OK.

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