output-style: replace Caveman with our own ClaudeX style

[Tanq16]

Replaces the Caveman output style with ClaudeX — the same terse, high-density reporting, rewritten as a pure information-density instruction in plain English, with the external attribution dropped so it's ClaudeX's own default in the global plugin.

Why

The old style leaned on a persona: the name "Caveman" plus a caveman-speak meme quote ("Why use many token when few token do trick."). That framing occasionally won over the density rules — under smaller/faster models in conversational turns, replies slipped into telegraphic grunt-speak ("Me hear you", "Single writer it is", dropped articles/copulas). The rewrite removes the persona entirely and positively requires grammatical full sentences, so density comes from cutting filler, not breaking grammar. No negative "don't do the caveman voice" example is needed once the persona itself is gone.

Changes

• output-styles/caveman.md → claudex.md: rewritten (Cut / Keep / Stay readable), name: ClaudeX, attribution removed, keep-coding-instructions: true retained.
• README.md: global-plugin bullet now names the ClaudeX output style.
• ai-docs/references/writing-style.md: "caveman-inspired" → "maximal information density".
• plugins_test.go: synthetic style fixtures renamed off "caveman" (test data only; behavior unchanged). No "caveman" string remains anywhere in the repo.

Validation

Ran a multi-agent comparison — 5 model seats (2 opus, 2 sonnet, 1 fable) × technical + conversational scenarios × three styles (no-style / old Caveman / new ClaudeX), 75 generations, each reply blind-scored for density, plain grammatical English, and persona leak:

Register	Style	Density	Plain English	Persona leaks
Technical (45)	ClaudeX	4.87	15/15	0
	Caveman	5.0	15/15	0
	normal	4.53	15/15	0
Conversational (30)	ClaudeX	4.5	10/10	0
	Caveman	4.4	9/10	0
	normal	3.7	10/10	0

• ClaudeX: dense (beats no-style, matches/approaches Caveman) and 100% plain grammatical English with zero persona leaks across every cell.
• The one conversational cell where Caveman cracked into telegraphic fragments (fable) is exactly where ClaudeX held grammar — the same model, scenario, and register.
• Honest limit: the prompt-injection harness didn't reproduce the full grunt-speak (it underrepresents a real system-prompt output style, and the current Caveman file already has a partial guard), so this is "ClaudeX is clean and strictly beats Caveman in the failure register," not a full reproduce-then-fix.

Notes

• Renaming the file leaves a stale caveman.md in any already-materialized ~/.config/claudex/global/output-styles/ (the builder writes files but doesn't prune dropped ones). This is expected and accepted; a clean rebuild (rm -rf ~/.config/claudex/global && claudex configure) removes it.
• [minor-release] in the title — user-facing default changes, and the release workflow reads the merge-commit subject.

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