Prepare for tinycloud 0.3.19: the silent-stop fix — surface and recover output-token truncation (no floor raise)

[kdr]

Summary

Prepares the distribution surfaces for tinycloud 0.3.19, a host-agent reliability release — the silent-stop fix. No new verbs, flags, or feature ids (verbs stay 17, features stay 42); the changes live in the interactive agent and headless -p, not the video-verb surface the skill drives.

The bug: adaptive-thinking chat models always stream a thinking block, and thinking spends from the same per-response max_tokens budget as text and tool calls. A long think could exhaust the old 8192-token cap, return stop_reason: max_tokens with no error, and the agent silently yielded mid-task with only a duration line (typing continue resumed it). 0.3.19:

• surfaces length-stopped turns (and empty stop-ended ones, e.g. a dropped stream) as a status line instead of a quiet handoff
• raises the cap 8192 → 32000, tunable via TINYCLOUD_MODEL_MAX_TOKENS (interactive + headless -p)
• blocks the final tool call of a length-stopped message with an error result (truncated tool-call JSON gets repaired into valid-but-incomplete args) so the model re-issues it in smaller pieces — wired in both agents
• auto-continues a truncated turn via a hidden prompt, bounded to 2 consecutive per user turn; disable with TINYCLOUD_AUTO_CONTINUE=0 or preferences.autoContinue: false
• labels streamed thinking with a "Reasoning" loader; headless -p --json traces gain an additive stop_reason field plus a stderr warning on truncation

Changes

• package.json, .claude-plugin/plugin.json, .claude-plugin/marketplace.json, tinycloud-skill.json skill_version → 0.3.19; README.md pin examples → 0.3.19
• Skill floor stays 0.3.18 (min_version/supported_range/preflight.sh/REQUIRED_FEATURES untouched — the 0.3.13 no-raise pattern; nothing the skill teaches changed)
• skills/tinycloud/reference/setup.md — TINYCLOUD_MODEL_MAX_TOKENS and TINYCLOUD_AUTO_CONTINUE added to the env-var table (0.3.19+), alongside the existing TINYCLOUD_MODEL_RETRIES host knob
• CLAUDE.md — 0.3.19 paragraph appended to the binary-contract history (CDN-state note stays 0.3.18, current reality; it gets its own docs bump when the CDN moves)

Verification

• npm test — 42/42 against the offline fixture CDN
• shellcheck install.sh scripts/smoke-test.sh skills/tinycloud/scripts/preflight.sh clean
• claude plugin validate . passed
• CI metadata-sync check run locally — in sync: 31 features, range >=0.3.18 <0.4.0
• TINYCLOUD_TEST_TARBALL=<real 0.3.19 tarball> npm test + smoke-test.sh against the extracted binary — pending the 0.3.19 binary release; run once artifacts exist, before merge

Merge gate

⚠️ Merge only after the CDN serves the 0.3.19 pinned tarballs and channels.stable = 0.3.19. No preflight-floor risk this time (floor stays 0.3.18), but the push-to-main npx-against-CDN leg packs the 0.3.19 launcher, which downloads exactly the pinned tinycloud-<platform>-v0.3.19.tar.gz — a CDN gap would fail the required live legs.

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Note

Low Risk
Packaging and documentation-only changes; no runtime code or skill compatibility floor changes.

Overview
Prepares the public distribution repo for tinycloud 0.3.19 — a host-agent reliability release (the “silent-stop fix”) — without raising the skill’s binary floor.

Version pins move to 0.3.19 in package.json, Claude plugin/marketplace metadata, tinycloud-skill.json skill_version, and README npx/install examples. min_version / supported_range / preflight stay at 0.3.18 (same pattern as 0.3.13: no new video verbs, flags, or feature ids).

Docs add CLAUDE.md release notes for 0.3.19 (higher default max_tokens, truncation surfacing, auto-continue, headless -p parity on retries/errors/stop_reason) and CI’s expected CDN stable channel 0.3.19. setup.md documents new env knobs TINYCLOUD_MODEL_MAX_TOKENS and TINYCLOUD_AUTO_CONTINUE, and clarifies TINYCLOUD_MODEL_RETRIES applies to headless -p as of 0.3.19.

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