refactor(skills): port pstack's token distill pass

[phob]

Ports upstream's "distill skill prompts to cut tokens" pass (cursor/plugins#538) to the 35 matching p3-stack files: 690 lines out, 376 in. Upstream merged sentences, folded bullet lists into prose, cut restatements, and shortened descriptions. Rules stay the same. Biggest cuts: why 155→97 lines, interrogate 105→70, arena 70→47, the why epistemics reference 144→71.

How it was merged. Our files had drifted from upstream through the T3 port and #5–#14, so a plain patch wouldn't apply. I ran git merge-file against upstream's before and after versions of each file:

• 18 files merged cleanly. 12 of them were still byte-identical to upstream's before-version.
• 8 small conflicts I resolved by hand. I kept the T3 wording where upstream's text named Cursor tools.
• 9 large conflicts went to Opus workers, one file each. Each worker got upstream's before-and-after versions, the merged file with its conflicts, and the list of T3 rules to keep.

Deliberate differences from upstream:

• figure-it-out stays model-invocable. Upstream flagged it typed-only, but p3-mode routes to it through the Skill tool, which refuses flagged skills.
• architect and the why synthesizer prompt keep the parts of their briefs that inline file content. A T3 child agent gets only its brief and can't resolve a relative path.
• p3-mode's principle index now uses upstream's rule: the file is the title in kebab case, unless the entry names its file. All 24 principles resolve under that rule.

Proof:

• Preservation check. A script compared every file against its pre-distill version. Every T3 tool name, p3-models.md role line, references/ path, and principle link survived. The one exception is the explain-the-number link in benchmark-checklist, which upstream dropped too.
• Rule phrases. The phrases from fix(p3-mode): drain delegates on wake, not by polling task_status #5–fix(swarm): never swap a rejected model-race arm #14 are still in p3-mode: stale-key warning, own every wake, inbox honest, render what prose can't carry, and plan-mode read-only.
• Hygiene. No conflict markers, no CRLF line endings, no Cursor terms.
• Gate. scripts/verify-routing.ps1 -StaticOnly passes.

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