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feat(persona): make the agent persona a composable row

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`dsh-system-prompt` owns the deployment persona as its own config and registers
that section unconditionally, so a process has exactly one. An agent preset
cannot mount the prompt registry itself, which means that without a row of its
own a preset could change an agent's tools but never its identity — and a
roster of presets that all sound the same is not worth having.

The row is scope-only by construction: mounted outside an agent scope it
collides with the registry's own `deployment:persona` registration and fails
loud. That is the correct shape rather than a gap, because the unscoped slot
already has an owner and this row exists to shadow it for one agent.

Two behaviours are pinned by test because both read the other way at a glance:
an empty persona still occupies the slot (shadowing the deployment persona away
entirely, then disappearing at render), and `assemble()` keeps section text
uninterpolated — `renderPrompt()` is the stage that resolves `{{…}}`.
This commit is contained in:
Yichen Jiang
2026-08-03 22:22:57 +08:00
parent e27d38efd6
commit 739042a804
14 changed files with 371 additions and 2 deletions
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packages/preset/README.md
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@@ -7,6 +7,7 @@ An **agent preset** is a directory holding one `agent.cordis.yml`. Mounting it u
| Package | Role | ctx key |
|---|---|---|
| `agent-presets/` | Preset vocabulary, filesystem discovery over trusted and user-authored roots, and the guarded per-agent mount | `ctx.agentPresets` |
| `persona/` | The agent persona as a composable row, so a preset can change identity and not only tools | — |
The composition split this group assumes: registries and cross-session facilities are process singletons and stay in the host composition, while a preset carries what one agent contributes to them. A preset that names a row publishing a process-global service is rejected at mount rather than allowed to collide with the next session.