lint: split space-separated bare names, drop the dead fixedNames

[NagyVikt]

Follow-up to #128. Reviewing that PR turned up two defects in its own change; it merged before the fixes landed, so both are live on main.

HIGH — space-separated bare names regressed

The pre-#128 code split on /[,\s]+/. readAllowedTools split on commas only:

Input	on main today	expected
allowed-tools: nmap, curl	Bash(nmap:*), Bash(curl:*)	same
allowed-tools: nmap curl	Bash(nmap curl:*)	Bash(nmap:*), Bash(curl:*)

Confirmed by executing applyFixes on both shapes, not by reading.

splitToolNames restores the old behaviour but keeps a part containing ( whole, so Bash(git diff:*) is not torn in half — a case the original only survived by early-returning on any wrapped value, which also meant it fixed nothing in a mixed list. So this is strictly better than either version.

MEDIUM — fixedNames is dead code

The fix closure recomputes the same map from a fresh parse, so the outer binding is never read. bun run lint flags it:

! This variable fixedNames is unused.
  > 335 │   const fixedNames = parsed.names.map((n) =>

#128 passed CI only because unused variables are a warning, not an error. Removed. The wrap predicate had been written out three times, which is how the dead copy went unnoticed; it is now isWellFormedTool + wrapTool.

Blast radius on the corpus: none

• No skill in the 453-skill library carries a bare multi-word allowed-tools value, so the HIGH never fired in practice.
• On its own base, the repaired fixer reproduces Apply mechanical lint fixes across the skill library (45 errors → 0) skills#21 byte-for-byte — that PR does not need regenerating.

Verification

Check	Result
bun test	3091 pass / 1 skip / 0 fail
bun run typecheck	clean
bun run lint	clean; the warning #128 added is gone
skill-linter.test.ts	94 tests (12 from #128, +4 here)

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