chore: drop the dead compareVersions and unexport nothing-imported symbols

- compareVersions had zero production callers (the gate rides
  meetsBaseline alone) and is not re-exported through the package entry;
  its spec block duplicated what meetsBaseline's cases already pin
  through compareParsed (a major-gap case joins meetsBaseline's block to
  keep every arm covered). isNewerVersion keeps its own numeric-only
  compare: ignoring prereleases there is the upgrade nudge's deliberate
  semantics, and adopting the channel-aware order would change
  user-visible behavior.
- pad2 hand-rolled padStart(2, '0') in a function that already used
  padStart for the year.
- StoredHeaderTool/StoredHeaderRecord and DecodeCounts/DecodeSpans lost
  export keywords nothing inside or outside the repo imported.

src/host/headers.ts

@@ -47,7 +47,7 @@ const HEADERS_MAX = 50
  * One stored tool: the v1 row shape carried the producer description and the
  * raw schema; folds since the #37 slim-down append metadata-only entries.
  */
-export interface StoredHeaderTool {
+interface StoredHeaderTool {
   name: string
   tokens: number
   description?: string
@@ -56,7 +56,7 @@ export interface StoredHeaderTool {
 }
 
 /** One stored epoch: v1 rows carried `system`; folds since carry `systemTokens`. */
-export interface StoredHeaderRecord {
+interface StoredHeaderRecord {
   seq: number
   time: number
   system?: string

src/host/logShapes.ts

@@ -55,10 +55,10 @@ export function decodeKindOfBlock(blockType: unknown): DecodeKind | undefined {
 }
 
 /** Per-kind decode spans (see {@link decodeTallyOfStream}). */
-export type DecodeSpans = Record<DecodeKind, number>
+type DecodeSpans = Record<DecodeKind, number>
 
 /** Per-kind count of opened decode blocks (see {@link decodeTallyOfStream}). */
-export type DecodeCounts = Record<DecodeKind, number>
+type DecodeCounts = Record<DecodeKind, number>
 
 /** Both decode tallies of one stream: the spans that price the split and the marker counts that qualify its rows. */
 export interface DecodeTally {

src/shared/days.ts

@@ -10,11 +10,6 @@
 /** The strict key shape (round-trip validated on construction too). */
 export const DAY_KEY_RE = /^\d{4}-\d{2}-\d{2}$/
 
-/** Zero-pad to two digits (no Intl allocation on the hot path). */
-function pad2(n: number): string {
-  return n < 10 ? '0' + String(n) : String(n)
-}
-
 /**
  * The local calendar-day key of an epoch-ms instant, or null when the time
  * is not a finite number or falls outside the representable date range —
@@ -25,7 +20,7 @@ export function dayKeyOf(time: number): string | null {
   const d = new Date(time)
   const y = d.getFullYear()
   if (!Number.isFinite(y) || y < 1970 || y > 9999) return null
-  return `${String(y).padStart(4, '0')}-${pad2(d.getMonth() + 1)}-${pad2(d.getDate())}`
+  return `${String(y).padStart(4, '0')}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`
 }
 
 /**

src/shared/version.ts

@@ -65,18 +65,6 @@ function compareParsed(a: ParsedVersion, b: ParsedVersion): number {
   return a.serial - b.serial
 }
 
-/**
- * Compare two version strings (negative / zero / positive). An unparseable
- * side compares EQUAL — the gate only ever acts on a strict, proven
- * below-baseline result.
- */
-export function compareVersions(a: string, b: string): number {
-  const x = parseVersion(a)
-  const y = parseVersion(b)
-  if (x === null || y === null) return 0
-  return compareParsed(x, y)
-}
-
 /**
  * Whether `version` satisfies the supported baseline. FAIL OPEN by design: a
  * version that cannot be parsed (a dev/nightly harness build) must not blank

tests/shared/version.spec.ts

@@ -4,7 +4,7 @@
 
 import assert from 'node:assert/strict'
 import { describe, test } from 'vitest'
-import { BASELINE_DSH_VERSION, compareVersions, meetsBaseline, parseVersion } from '../../src/shared/version'
+import { BASELINE_DSH_VERSION, meetsBaseline, parseVersion } from '../../src/shared/version'
 
 describe('parseVersion', () => {
   test('parses plain releases, channels, serials, v-prefixes and build metadata', () => {
@@ -23,25 +23,6 @@ describe('parseVersion', () => {
   })
 })
 
-describe('compareVersions', () => {
-  test('orders numerically, then channel (release > rc > beta > alpha), then serial', () => {
-    assert.ok(compareVersions('1.0.0', '0.9.9') > 0)
-    assert.ok(compareVersions('0.2.0', '0.1.9') > 0)
-    assert.ok(compareVersions('0.1.3', '0.1.2') > 0)
-    assert.ok(compareVersions('0.1.2', '0.1.2-rc.9') > 0, 'final outranks rc')
-    assert.ok(compareVersions('0.1.2-rc.1', '0.1.2-beta.9') > 0, 'rc outranks beta')
-    assert.ok(compareVersions('0.1.2-beta.1', '0.1.2-alpha.9') > 0, 'beta outranks alpha')
-    assert.ok(compareVersions('0.1.2-rc.2', '0.1.2-rc.1') > 0, 'higher serial wins')
-    assert.equal(compareVersions('0.1.2-rc.1', '0.1.2-rc.1'), 0)
-    assert.ok(compareVersions('0.1.3-alpha.1', '0.1.2') > 0, 'a newer X.Y.Z beats any older channel')
-  })
-
-  test('an unparseable side compares equal', () => {
-    assert.equal(compareVersions('dev-build', '0.1.2'), 0)
-    assert.equal(compareVersions('0.1.2', 'dev-build'), 0)
-  })
-})
-
 describe('meetsBaseline', () => {
   test(`the supported baseline is ${BASELINE_DSH_VERSION}`, () => {
     assert.equal(BASELINE_DSH_VERSION, '0.1.7-rc.2')
@@ -53,6 +34,7 @@ describe('meetsBaseline', () => {
     assert.equal(meetsBaseline('0.1.7'), true, 'the final release of the baseline line')
     assert.equal(meetsBaseline('0.2.0-rc.2'), true, 'the newest supported line')
     assert.equal(meetsBaseline('0.2.0-alpha.1'), true, 'a newer X.Y.Z outranks any channel (the 0.2.0 previews pass)')
+    assert.equal(meetsBaseline('1.0.0-alpha.1'), true, 'a newer major outranks everything below it')
     assert.equal(meetsBaseline('0.1.7-rc.1'), false, 'an older rc of the baseline line')
     assert.equal(meetsBaseline('0.1.7-alpha.1'), false, 'alpha is below rc at equal X.Y.Z')
     assert.equal(meetsBaseline('0.1.6'), false, 'a hypothetical final of the dropped cycle')