fix(guard-size): preview base branch ceilings (sc-1494)

[norvalbv]

Summary

• read the raw-line baseline from the exact ship base before creating a worktree
• print current lines, effective ceiling, headroom, and working-tree/base drift
• share authoritative size policy and mirror gate semantics for shipped baselines, skipped directories, and disabled caps
• distinguish proven violations from unavailable preview reads, which defer to the authoritative gate
• run the preview from the repository root for both new ships and PR reships
• document the standalone command and add focused unit plus ship integration regressions
• repair the pre-existing PR feat(review): sentry-additive restages keep earned verdicts, sentry judge gets a cache #370 test fixture encoding that made main fail Biome, without changing its value

Root cause

The authoritative guard runs in the ship worktree, where the baseline comes from the selected base. The shared checkout could expose a different size-lines baseline, so contributors could not see the real cap until after the expensive gate chain started.

Validation

• clean detached origin/main build: bun run build
• Story #1494 focused regressions: 9 passed
• diff-focus prerequisite regression: 30 passed
• base-aware preflight against origin/main: all changed source/test files within their effective ceilings
• duplication guard: PASS
• GitNexus scoped Story #1494 change audit: LOW risk, zero affected processes

Story: sc-1494
Autonomous report: 20dc0667-a65d-4cf8-9284-09080bc91ff7

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fbd472d8-14a5-4e93-a999-eafa96dd9f4c

📥 Commits

Reviewing files that changed from the base of the PR and between 7a75b93 and 33515d8.

⛔ Files ignored due to path filters (7)

• dist/cli/lib/ship/prepare-gate-worktree.sh is excluded by !**/dist/**
• dist/cli/lib/ship/reship.sh is excluded by !**/dist/**
• dist/cli/lib/ship/ship-branch.sh is excluded by !**/dist/**
• dist/gate-engine/ratchets/size-disable.mjs is excluded by !**/dist/**
• dist/gate-engine/ratchets/size-policy.mjs is excluded by !**/dist/**
• dist/gate-engine/ratchets/size-preflight.mjs is excluded by !**/dist/**
• dist/skills/using-devkit/SKILL.md is excluded by !**/dist/**

📒 Files selected for processing (10)

• cli/__tests__/ship-branch.test.mts
• cli/lib/ship/prepare-gate-worktree.sh
• cli/lib/ship/reship.sh
• cli/lib/ship/ship-branch.sh
• gate-engine/judge/__tests__/diff-focus.test.mts
• gate-engine/ratchets/__tests__/size-preflight.test.mts
• gate-engine/ratchets/size-disable.mts
• gate-engine/ratchets/size-policy.mts
• gate-engine/ratchets/size-preflight.mts
• skills/using-devkit/SKILL.md

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