T5: OpenClaw manifest attach_probe + steering-plugin copy retirement

[philcunliffe]

Implements task T5 of openclaw-two-lane-capture.

• hypaware-core/plugins-workspace/openclaw/hypaware.plugin.json: adds contributes.client.attach_probe per design 1.4 (json_path format, .openclaw/openclaw.json settings file, models.providers container, anthropic/openai provider keys, x-hypaware-upstream marker header, agents/*/agent/models.json cache glob); rewrites description and picker[0].summary to drop every @hypaware/openclaw-steering-plugin reference and state the two capture tiers directly (live gateway capture once attached, plus periodic transcript sweep).
• hypaware-core/plugins-workspace/claude/hypaware.plugin.json: adds the LLP 0167#onboarding line naming the claude-cli/ case OpenClaw's CLI-backend exclusion produces.
• hypaware-core/plugins-workspace/openclaw/src/projector.js: corrects the stale "written by the openclaw-steering-plugin" comment on UPSTREAM_HEADER to describe the config-override write attach() makes.
• test/plugins/openclaw-manifest.test.js (new): manifest-shape test asserting attach_probe parses to the exact design-1.4 fields, and that description/summary no longer match /openclaw-steering-plugin/.
• test/plugins/openclaw-client-registration.test.js: updates the one existing assertion this manifest change makes false (the R7 "no attach_probe" descriptor check) to the restored json_path shape. The remaining behavioral rewrites in that file (no-op attach/detach tests, restart-instruction assertions) are T10's scope.

Test plan

• npm test (3313 pass, 1 pre-existing skip, 0 fail)
• npm run typecheck (clean)

Task-Id: T5