feat(claws): publish CLAW.md prompts

[giodl73-repo]

Follows merged #3092
Related: openclaw/rfcs#48 and merged openclaw/openclaw#113454

What Problem This Solves

ClawHub's first four experimental slices introduced Claw publication, discovery, and the hosted feed. Their initial CLAW.md body handling required a body and carried its text in the validated package object, which did not match the approved portable prompt contract.

Why This Change Was Made

Publication now treats only a non-whitespace CLAW.md body as the implicit SOUL.md source, allows frontmatter-only CLAW.md, rejects exact or hierarchical workspace conflicts with implicit SOUL.md, and derives the existing bounded capability summary without retaining a second prompt copy. ClawHub validates OpenClaw profile shape without freezing the applying OpenClaw version's evolving built-in profile registry. The hosted fixture proves the exact artifact produces a managed SOUL.md dry-run action without exposing prompt text.

This is the fifth ClawHub slice after the merged #3089-#3092 track. It remains gated by CLAWHUB_EXPERIMENTAL_CLAWS=1.

User Impact

Experimental ClawHub packages can use one human-readable CLAW.md as both manifest envelope and portable agent prompt. Search, detail, and feed summaries report the resulting SOUL.md capability while the exact prompt remains only in the stored artifact. Frontmatter-only packages and grouped JSON with explicit SOUL.md sidecars remain valid.

AI-assisted: implementation and review were completed with Codex; I understand the validation, storage, and feed behavior.

Evidence

• Restacked onto current ClawHub main after Add gated Claw hosted feed and lifecycle proof #3092 merged; the cross-repo contract now uses canonical openclaw/openclaw.
• Focused shared-schema and publication suite passes: 363/363.
• Exact Claw CLI publication test passes.
• Generated schema output and git diff checks are clean.
• The pre-restack feed/archive suite passed 5 tests with 2 environment-gated, and autoreview reported no actionable findings.

Post-review validation

• Three independent model reviews were reconciled across the RFC, OpenClaw, and ClawHub implementation.
• Exact-head CI run 30143787190 passes the cross-repo OpenClaw contract plus static, unit, package, type/build, HTTP, and browser lanes.
• Focused package and workflow tests pass: 56/56.
• Shared-schema generation and both schema/CLI TypeScript builds pass.
• The cross-repo contract job is pinned to merged OpenClaw #113454 commit e79faff8aa755b201302edd286976a03f9ed79ea, which includes prompt lifecycle validation.
• Changed files pass Oxfmt, zero-warning Oxlint, and git diff --check.

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