docs: add models cli plan

docs/models.md

@@ -0,0 +1,79 @@
+---
+summary: "Plan for models CLI: scan, list, aliases, fallbacks, status"
+read_when:
+  - Adding or modifying models CLI (models list/set/scan/aliases/fallbacks)
+  - Changing model fallback behavior or selection UX
+  - Updating model scan probes (tools/images)
+---
+# Models CLI plan
+
+Goal: give clear model visibility + control (configured vs available), plus scan tooling
+that prefers tool-call + image-capable models and maintains ordered fallbacks.
+
+## Command tree (draft)
+
+- `clawdis models list`
+  - default: configured models only
+  - flags: `--all` (full catalog), `--local`, `--provider <name>`, `--json`, `--plain`
+- `clawdis models status`
+  - show default model + last used + aliases + fallbacks
+- `clawdis models set <modelOrAlias>`
+  - writes `agent.model` in config
+- `clawdis models aliases list|add|remove`
+  - writes `agent.modelAliases`
+- `clawdis models fallbacks list|add|remove|clear`
+  - writes `agent.modelFallbacks`
+- `clawdis models scan`
+  - OpenRouter :free scan; probe tool-call + image; interactive selection
+
+## Config changes
+
+- Add `agent.modelFallbacks: string[]` (ordered list of provider/model IDs).
+- Keep existing:
+  - `agent.model` (default)
+  - `agent.allowedModels` (list filter)
+  - `agent.modelAliases` (shortcut names)
+
+## Scan behavior (models scan)
+
+Input
+- OpenRouter `/models` list (filter `:free`)
+- Optional filters: `--max-age-days`, `--min-params`, `--provider`, `--max-candidates`
+
+Probes (direct pi-ai complete)
+- Tool-call probe (required):
+  - Provide a dummy tool, verify tool call emitted.
+- Image probe (preferred):
+  - Prompt includes 1x1 PNG; success if no "unsupported image" error.
+
+Scoring/selection
+- Prefer models passing tool + image.
+- Fallback to tool-only if no tool+image pass.
+- Rank by: tool+image first, then lower median latency, then larger context.
+
+Interactive selection (TTY)
+- Multiselect list with per-model stats:
+  - model id, tool ok, image ok, median latency, context, inferred params.
+- Pre-select top N (default 6).
+- Non-TTY: auto-select; require `--yes` or use defaults.
+
+Output
+- Writes `agent.modelFallbacks` ordered.
+- Optional `--set-default` to set `agent.model`.
+
+## Runtime fallback
+
+- On model failure: try `agent.modelFallbacks` in order.
+- Persist last successful provider/model to session entry.
+- `/status` shows last used model (not just default).
+
+## Tests
+
+- Unit: scan selection ordering + probe classification.
+- CLI: list/aliases/fallbacks add/remove + scan writes config.
+- Status: shows last used model + fallbacks.
+
+## Docs
+
+- Update `docs/configuration.md` with `agent.modelFallbacks`.
+- Keep this doc current when CLI surface or scan logic changes.