docs: fix remaining stale provider references in quick-reference and authoring guide

- quick-reference.md: per-node provider type changed from enum to string
- quick-reference.md: model mismatch guidance updated for registry pattern
- authoring-workflows.md: provider comment says 'any registered provider'

packages/docs-web/src/content/docs/book/quick-reference.md

@@ -128,7 +128,7 @@ All nodes share these base fields:
 | `depends_on` | No | string[] | Node IDs that must complete before this node runs |
 | `when` | No | string | Condition expression; node is skipped if false |
 | `trigger_rule` | No | string | Join semantics when multiple upstreams exist (see Trigger Rules) |
-| `provider` | No | `claude` \| `codex` | Per-node provider override |
+| `provider` | No | string | Per-node provider override (any registered provider) |
 | `model` | No | string | Per-node model override |
 | `context` | No | `fresh` \| `shared` | Session context — `fresh` starts a new conversation, `shared` inherits from prior node |
 | `output_format` | No | JSON Schema | Enforce structured JSON output from this node |
@@ -272,7 +272,7 @@ defaults:
 | `Routing unclear — falling back to archon-assist` | No workflow matched the input | Use an explicit workflow name: `archon workflow run my-workflow "..."` |
 | `Worktree already exists for branch X` | Prior run left a worktree | Run `archon complete X` or `archon isolation cleanup` |
 | `Not a git repository` | Running outside a repo | `cd` into a git repo first — workflow and isolation commands require one |
-| `Model X is not valid for provider Y` | Provider/model mismatch | Use Claude models (`sonnet`, `opus`, `haiku`) with `provider: claude`; use other models with `provider: codex` |
+| `Model X is not valid for provider Y` | Provider/model mismatch | Each provider accepts specific models — check the provider's `isModelCompatible` rules. Claude accepts `sonnet`, `opus`, `haiku`, `claude-*`; Codex accepts other models. |
 | `$BASE_BRANCH referenced but could not be detected` | No base branch set and auto-detection failed | Set `worktree.baseBranch` in `.archon/config.yaml` or ensure `main`/`master` exists |
 | Workflow hangs with no output | Node idle timeout hit | Increase `idle_timeout` on the node (milliseconds) |
 

packages/docs-web/src/content/docs/guides/authoring-workflows.md

@@ -542,7 +542,7 @@ Model and options are resolved in this order:
 
 ```yaml
 name: my-workflow
-provider: claude     # 'claude' or 'codex' (default: from config)
+provider: claude     # Any registered provider (default: from config)
 model: sonnet        # Model override (default: from config assistants.claude.model)
 ```