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Michael Neale 9ca88061fa Merge origin/main into micn/buzz-agent-goose-core

82 commits of main, plus the goose pin moved from bf332b9 to 7c4ba22
(60 commits) because main's changes and goose's API changes overlap.

Conflict resolutions worth knowing about:

* `llm.rs`, `handoff.rs`, `tests/regressions.rs` — main changed files this
  branch deletes. Reviewed each change rather than dropping it silently:
  #5475 raised `BUZZ_AGENT_MAX_OUTPUT_TOKENS` and the truncation-recovery
  allowance in buzz's own request loop, which no longer exists; goose owns
  retries and output limits now, so there is nothing to port.

* `model_capabilities.rs` (#5597) moved to `buzz-model-catalog`, not kept in
  `buzz-agent`. The manifest is read by the desktop model picker, which
  cannot link goose (`libsqlite3-sys` collision), so it has to live in the
  crate the desktop already depends on. `ThinkingEffort` moved with it,
  reduced to the vocabulary the manifest is typed in — the request-path
  mapping went with buzz's HTTP transport. The 103-vector corpus guard
  passes in its new home; `just ci` and `regen-model-corpus` now point at
  it, and `run-tests.sh` runs the new crate's lib tests.

* Curated model labels reach the picker. main added them to the Databricks
  discovery path; on this branch `session/new` enumerates through goose's
  provider API instead, so the label lookup had to be applied there or
  #5597 would have been silently reverted for every provider.

goose API changes this bump required:

* `StateMachine`/`Step`/`Operation` are generic over session and effect
  type, and the loop moved into a new `goose-agent` crate.
* `StateEffect` split: buzz now names `ConversationEffect`, the narrow set,
  rather than goose's `GooseEffect`. `ReplaceConversation` lost its `usage`
  field — buzz always passed `None`, and the driving loop already resets
  the running total, so this is a rename not a behaviour change.

78 unit + 22 integration tests pass, clippy `-D warnings` and fmt clean on
the pinned 1.95.0 toolchain.

Co-authored-by: Michael Neale <michael.neale@gmail.com>
Signed-off-by: Michael Neale <michael.neale@gmail.com>

2026-08-18 11:43:30 +10:00