--ecosystems rejects NPM and npm, pypi, which socket.yml patches.ecosystems accepts: the ecosystem name parser is written three times #773

[agent] Filed by the scheduled architecture audit routine (CLI and core). Register: discussion #560 register.

Kind: bug. Source: new finding; register C44.

Problem

Verified on main @ 045d7ec. The same ecosystem scope filter accepts different spellings depending on where it is set:

• Flag/env: --ecosystems / SOCKET_ECOSYSTEMS goes through parse_supported_ecosystem, which requires an exact, case-sensitive match on cli_name() with no trim (args.rs#L33-L44).
• Config: socket.yml patches.ecosystems trims, lowercases and offers a "did you mean" hint (socket_yml.rs#L602-L631).`` The test every_key_parses pins `ecosystems: [NPM, pypi]` as valid.
• Third copy: vendor::ecosystem_in_scope does its own exact cli_name() == eco lookup (vendor.rs#L343-L352).

The sibling filter shows the intended shape: --min-severity and socket.yml minSeverity share one parser (policy::parse_min_severity → socket_yml::parse_severity_name, which trims and ignores case), so --min-severity High and minSeverity: High agree.

Proof by execution (debug CLI built from 045d7ec, run twice):

$ socket-patch list --json --ecosystems NPM
error: invalid value 'NPM' for '--ecosystems <ECOSYSTEMS>': unsupported ecosystem `NPM` (supported: npm, pypi, …)   # exit 2
$ socket-patch list --json --ecosystems "npm, pypi"
error: invalid value ' pypi' for '--ecosystems <ECOSYSTEMS>': unsupported ecosystem ` pypi` …                      # exit 2
$ SOCKET_ECOSYSTEMS=PyPI socket-patch list --json                                                                     # exit 2
$ cargo test -p socket-patch-core --lib policy::socket_yml::tests::every_key_parses                                  # ok: [NPM, pypi] → ["npm","pypi"]

--min-severity High and --min-severity " high" both parse.

Symptoms

None filed. Impact: a user who copies ecosystems: [NPM, PyPI] from socket.yml into SOCKET_ECOSYSTEMS, or writes -e "npm, pypi", gets a usage error (exit 2) from the flag while the file form works. That is an inconsistent CLI surface with a small blast radius (p3).

Proposed change

• Add Ecosystem::from_cli_name(&str) -> Option<Ecosystem> in crawlers/types.rs (trim + ASCII-lowercase) and one shared rejection message with the "did you mean" hint.
• Use it in parse_supported_ecosystem (which stores the canonical cli_name()), in socket_yml ecosystems, and in vendor::ecosystem_in_scope.
• Delete: the exact-match lookup in args.rs, the inline known/to_lowercase loop in socket_yml.rs and the lookup in vendor.rs.
• Contract: accepting more spellings is additive, and the value_delimiter = ',' behavior pinned in CLI_CONTRACT stays. Add one sentence to the --ecosystems row ("case-insensitive; surrounding spaces ignored").

Size and scope

crawlers/types.rs, cli/src/args.rs, policy/socket_yml.rs, commands/vendor.rs and CLI_CONTRACT.md. About 60 production lines. Out of scope: other enum flags.

Acceptance criteria

• --ecosystems NPM, -e "npm, pypi" and SOCKET_ECOSYSTEMS=PyPI parse to ["npm"], ["npm","pypi"] and ["pypi"] (args unit test).
• --ecosystems bogus and the empty-token message stay as they are; socket.yml [npn] keeps its "did you mean npm" hint, and the flag gains the same hint.
• every_key_parses, ecosystems_flag_splits_and_validates and the socket.yml error-path table (patches.ecosystems[0]) stay green.
• grep -rn "cli_name() ==" crates/*/src has no production matches outside from_cli_name.

Dependencies

None. Touches commands/vendor.rs lightly; no conflict with the arch-refactor PRs.