fix(status): recommend ranges view in acp_status prompt snippet

[ranxianglei]

Problem

acp_status promptSnippet suggested scope:"uncompressed" + view:"messages", steering models to the per-message firehose. Combined with the kernel's ranges view collapsing dense refs into one giant range, the tool's output was not actionable by range - see #193.

Fix

promptSnippet now recommends acp_status({ scope: "uncompressed" }) (the ranges view), which acp-kernel PR ranxianglei/acp-kernel#165 makes actionable: ranges grouped by conversation turn, sorted by size.

One-line change in src/status-tool.ts. typecheck + 428 tests + build all pass.

[github-actions]

📦 Built Extension Artifact

Branch: 2026-08-26_status-prompt-ranges (18b276b)

Option A — Install from npm PR tag (recommended)

pi install npm:billion-context-pi@pr-233

Each push to this PR publishes a new version under the pr-233 npm tag.

Option B — Download artifact

1. Download the artifact from the Actions run
2. Extract the tarball and install:

tar xzf billion-context-pi-pr233.tgz
pi install ./package

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This comment is automatically updated on each push.

[ranxianglei]

[bot] Reviewed and verified PR branch 2026-08-26_status-prompt-ranges (commit 18b276b):

• Diff is exactly the claimed one-line change in src/status-tool.ts:27: promptSnippet now reads acp_status({}) or acp_status({ scope: "uncompressed" }) — steering models to the ranges view instead of the per-message firehose.
• description still documents view:'messages' as an available option (not a recommendation), which is consistent.
• No tests assert the snippet text, so nothing stale to update.
• Local CI run on the branch: npm run typecheck clean, npm test 428/428 pass, npm run build succeeds and the new snippet is present in dist/index.js.
• No acp-kernel bump needed — this is prompt-only; the actionable ranges view comes from acp-kernel PR 跟踪 acp-kernel#86:pending nudge 半阈值接线 — 升级-only 影响 / 适配方案 / 后果评估 #165 shipping separately.

Ready for merge (human-only per repo rules).