feat(evolve): enhance EvolveState to track last evolution state and preserve chat memory for conversational Begin's

[Scott McMaster (scottmcmaster)]

Summary

Adds the last evolution state to the EvolveState structure, which seems generally useful, but specifically useful to fix a case where we'd clear chat memory when re-entering Begin on a conversational response to Begin, which can cause unexpected agent behavior on follow-up requests.

Test Plan

Updated unit tests and did manual testing that proved this fixes the conversational Begin behavior I referred to.

Docs

• Docs updated
• No docs update needed

[github-actions]

	Warnings
⚠️	Please assign this PR to someone (usually yourself).

	Messages
📖	No docs update needed — acknowledged.

📋 PR Overview

Lines changed	70 (+61 / -9)
Files	0 added, 4 modified, 0 deleted
Draft / WIP	no
Has Test Plan	yes
New UI components	no
New Storybook stories	no
New Rust modules	no
New TS source files	no
New tests	no
package.json touched	no
Cargo.toml touched	no
Infra / CI touched	no

🔬 Coverage

Report	Lines	Statements	Functions	Branches
apps/native/coverage/coverage-summary.json	17.3%	17.3%	27.8%	52.9%

Generated by 🚫 dangerJS against 786f262

[Copilot]

Pull request overview

This PR extends the persisted EvolveState to track the most recently observed EvolutionState, and uses that to avoid clearing in-memory chat context when re-entering Begin after a conversational (no-edits) evolution result—preventing unexpected agent behavior on follow-up prompts.

Changes:

• Add last_evolution_state: Option<EvolutionState> to EvolveState (with serde defaulting for backwards compatibility).
• Update evolve lifecycle to persist last_evolution_state for conversational, successful, and failure paths.
• Adjust Begin-step chat-memory clearing logic to preserve memory for conversational Begin cycles and expand unit tests accordingly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
apps/native/src-tauri/src/state/evolve_state.rs	Adds conversational-preservation logic for Begin and updates tests for chat-memory clearing behavior.
apps/native/src-tauri/src/shared_types/evolve.rs	Extends EvolveState with a new persisted last_evolution_state field.
apps/native/src-tauri/src/managed_edits/managed_edit.rs	Updates EvolveState struct literal initialization to include the new field.
apps/native/src-tauri/src/evolve/lifecycle.rs	Persists last_evolution_state for conversational short-circuit, successful evolution completion, and failure recovery.

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