fix(coding-agents): start daemon for dsh adapter

[koriyoshi2041]

Closes #3524.

The dsh adapter now routes daemon-mode workspaces through the shared daemon lifecycle:

• session start starts or adopts the local daemon with the normal startup budget
• resumed sessions retry at pre-step before recall
• turn stopping gets the longer retain budget before write-back
• Cloud and self-hosted modes remain no-ops through the existing ensureDaemon guard

A regression covers daemon startup before workspace seeding.

Validation:

• focused dsh + daemon tests: 24 passed
• package suite: 48 files / 518 tests passed; 3 unrelated suites could not import locally because the existing install lacks @modelcontextprotocol/sdk and @opencode-ai/plugin
• repository pre-commit lint hooks passed
• Prettier and diff checks passed