v0.2.3 Small-Model Robustness

Dogfooding fixes: the issues came from running Tether with a small model (GLM-5.3) on its own backlog.

Features

• tether read <id> --full (#72): the CLI now accepts the same --full form as the in-session agent read; it prints the full result (already the CLI default), --digest still gives the compact card.

Fixes

• Gate errors vs failures (#33): a broken verify gate (sandbox violation, exit 124/126/127) fails the session immediately with Verification gate ... misconfigured: <reason> instead of burning the 3-failure abort budget; tether stats shows a GATE_ERR column.
• edit write overwrite summary (#40): overwriting an existing file reports Replaced N lines with M (X removed, Y added; first removed: ...) and points to edit replace --lines a:b when the file shrank.
• Skill tools.py warning (#24): a @tool defined in tools.py but not listed in the skill's tools: now warns at load (0 prompt tokens); docs say the tools stay opt-in.
• Cycle detection (#39): repeated multi-command cycles (e.g. cat / sed / pytest, or alternating sed -n ranges) trigger a deterministic [CYCLE DETECTED] nudge and a new cycle_stall event type, shown as CYCLES in tether stats.
• Provider retry (#70): HTTP providers retry timeouts, network errors and 429/5xx twice with backoff, honour timeout from providers.yaml for all kinds, and fail with a ProviderError naming provider, model and timeout instead of a bare ReadTimeout.
• No more re-read loops (#69): the latest read of each of the last 4 files stays unfolded until that path is edited (or re-read); the fold hint only mentions mem recall when mem is enabled. Static prompt prefix unchanged.
• Clearer errors (#71): a provider 401/403 names the provider and the api_key_env as missing or rejected (never its value); a declared but empty api_key_env fails before the first request; a disabled built-in tool says it is disabled and how to enable it.

Docs: https://igormcsouza.github.io/tether/release-notes/