Merge remote-tracking branch 'origin/master' into codex/remove-stdio-agent

# Conflicts:
#	AGENTS.md
#	docs/config-catalog.md
#	examples/echo-agent/README.md
#	packages/examples/stdio-demo/README.md
#	packages/examples/stdio-demo/src/index.ts
#	packages/examples/stdio-demo/tests/built-bin.e2e.ts
#	packages/examples/stdio-demo/tests/stdio-agent.spec.ts
#	scripts/run-gates.ts

examples/headless-agent/advanced.cordis.yml

@@ -10,6 +10,7 @@
           provider: deepseek
           model: deepseek-v4-flash
           persistenceRoot: './.sessions'
+          persistenceCompression: !!js "process.env.DSH_SNAPSHOT === undefined ? 'zstd' : 'none'"
           workspaceContext:
             maxBytes: 65536
           tools:

examples/headless-agent/cordis.yml

@@ -25,6 +25,7 @@
     provider: deepseek
     model: deepseek-v4-flash
     persistenceRoot: './.sessions'
+    persistenceCompression: !!js "process.env.DSH_SNAPSHOT === undefined ? 'zstd' : 'none'"
     workspaceContext:
       maxBytes: 65536
     persona: |

examples/headless-agent/tests/fixtures/time-context.cordis.yml

@@ -15,4 +15,5 @@
     model: time-context-mock
     persona: 'Test the time-context plugin.'
     persistenceRoot: './.sessions'
+    persistenceCompression: 'none'
     workspaceContext: false

examples/headless-agent/tests/keyless-smoke.e2e.ts

@@ -1,4 +1,7 @@
-import { readdir } from 'node:fs/promises'
+import { readFile, readdir } from 'node:fs/promises'
+import { zstdDecompress } from 'node:zlib'
+import { promisify } from 'node:util'
+import { join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { describe, expect, it } from 'vitest'
 import { LOADER_SMOKE_TEST_TIMEOUT_MS, runLoaderSmoke } from '@deepseek-ai/dsh-loader-smoke'
@@ -7,10 +10,11 @@ import type { SessionEvent } from '@deepseek-ai/dsh-session'
 const binScript = fileURLToPath(new URL('../../../packages/examples/cli-demo/src/bin.ts', import.meta.url))
 const configPath = fileURLToPath(new URL('./fixtures/cli.cordis.yml', import.meta.url))
 const tsconfigPath = fileURLToPath(new URL('../../../tsconfig.json', import.meta.url))
+const decompress = promisify(zstdDecompress)
 
 describe('headless-agent keyless smoke', () => {
   it('boots the real Loader tree, runs a real bash tool round trip, and persists the turn', async () => {
-    let persisted = false
+    let persistedHeader: Record<string, unknown> | undefined
     const { stdout, stderr } = await runLoaderSmoke({
       label: 'headless-agent',
       tempDirPrefix: 'headless-agent-smoke-',
@@ -20,7 +24,11 @@ describe('headless-agent keyless smoke', () => {
       tsconfigPath,
       inspect: async (cwd) => {
         const files = await readdir(cwd, { recursive: true })
-        persisted = files.some(file => file.endsWith('.jsonl'))
+        const relativePath = files.find(file => file.endsWith('.jsonl.zstd'))
+        if (relativePath === undefined) return
+        const compressed = await readFile(join(cwd, relativePath))
+        expect(compressed.subarray(0, 4).toString('hex')).toBe('28b52ffd')
+        persistedHeader = JSON.parse((await decompress(compressed)).toString()) as Record<string, unknown>
       },
     })
     const lines = stdout.trimEnd().split('\n').map(line => JSON.parse(line) as Record<string, unknown>)
@@ -38,6 +46,6 @@ describe('headless-agent keyless smoke', () => {
       usage: { inputTokens: 18, outputTokens: 8, cacheReadTokens: 2, reasoningTokens: 1 },
     })
     expect(String(result?.['result'])).toContain('CLI_TOOL_ROUND_TRIP')
-    expect(persisted).toBe(true)
+    expect(persistedHeader).toMatchObject({ type: 'session' })
   }, LOADER_SMOKE_TEST_TIMEOUT_MS)
 })