v3.8.0-alpha.7 — Model routing: prefer the session model

The plugin no longer hardcodes a stronger model (Opus) for "complex" work, nor pins substantive agents to Sonnet. It now inherits the session model by default — so a newer/stronger model the user launches flows through automatically, with no plugin update needed to "keep up." The only deliberate override is down-shifting to haiku for trivial mechanical work.

Changed

• rules/core/small-to-large-routing.md rewritten — from a Haiku→Sonnet→Opus ladder with "start Opus for hard problems" to "prefer the session model; down-shift to haiku only for trivial work; never force-upgrade to a named model." The session model is the ceiling; there is no escalation to a hardcoded model. Defaults table: substantive agents → inherit; only the trivial detectors keep haiku.
• skills/agent-detector/SKILL.md Model Selection — was Quick→haiku, Standard→sonnet (opus for architecture/design), Deep→sonnet (opus for planning); now Quick/classification → haiku, everything else inherits the session model.
• Stripped per-agent model: overrides so they inherit the session model: strategist, tester, security, devops (were model: sonnet), plus reasoning skills problem-solving, sequential-thinking. Deliberate haiku floors kept on scanner, agent-detector, git-workflow, session-continuation.
• Reframed model-named guidance to be capability-based (future-proof, no stale model names): rules/core/context-management.md compaction strategy now keys off context-window size (small/mid vs large) instead of Haiku/Sonnet/Opus; rules/workflow/dual-llm-review.md reviewer selection now matches the session model tier instead of naming Opus/Sonnet/Haiku.
• Doc sync: agents/README.md frontmatter schema + rules (omit model: to inherit; haiku only as a cheap floor), rules/README.md one-line description.

Why

New model releases no longer require a plugin update to be used for complex work — the user's session model choice is the single source of truth. Removes the anti-pattern the routing rule itself warned against ("set a fixed model per agent regardless — breaks Opus-session users' intent").

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