feat: phase 3 — capability-derived host tiers, asymmetry notes, open-set docs (D-2/F-25/F-26/F-27) - #150
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…ames Phase 3 (D-2, F-25, F-26): hostTierLabel() derives a plain phrase from a host's capabilities — 'drives sessions · can lead' for a primary host, 'routing only · supervised · not AQE' for a supervised one, 'routing only · external adapter' for an admitted external — replacing x/host.mjs's h.id === 'opencode' tier ternary. hostAsymmetryNote() states the cross-host MCP delegation bridge (F-25) and the permission consent boundary / absent backend env flag (F-26) from each host's own trust manifest and capability set. Both are true by construction for any host, built-in or admitted; no new tier jargon.
Phase 3 (F-27): HOST-SUPPORT.md presents claude/codex/opencode as the built-in execution hosts and notes external adapters can extend the set behind the experimental flag (ADR-0029), rather than 'the three execution hosts'; ubiquitous-language defines host by registry capability with the three as built-in examples. Current-state voice; every factual row about the built-ins unchanged.
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The final program increment: the host-facing vocabulary stops hardcoding tiers by name and the docs stop claiming a closed host set.
hostTierLabel()derives a plain phrase from capabilities — 'drives sessions · can lead' (primary), 'routing only · supervised · not AQE' (opencode), 'routing only · external adapter' (admitted) — replacing theh.id === 'opencode'tier ternary. No tier nouns, no glossary; true by construction for any host including a future admitted one.hostAsymmetryNote()states the cross-host MCP delegation bridge and the permission consent boundary from each host's own trust manifest + capabilities, not per-id literals.Full gate green (1,682 tests). Depends on Wave 2 (status refactor) and Wave 4 (registry overlay), both merged.
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