feat(compact): rename wire strategy 'truncate' to 'trim-tool-results' (PRI-1825)

## Summary The RPC strategy enum at `ent/session/compact` accepted `'truncate'` and dispatched it to the `trim-tool-results` registry strategy. The wire name actively misled callers — the strategy doesn't drop messages, it trims TOOL_RESULT text blocks to 3 lines. Rename the wire enum to match the internal strategy ID. - Updates `EntSessionCompactParamsSchema` in `@lace/ent-protocol` - Updates the dispatch + default in `session-operations.ts` - Updates the two tests that hardcoded the wire name (`agent-process.e2e`, `session-operations.compact-budget`) - Hard rename, no back-compat alias (pre-release v1, internal protocol) [Linear: PRI-1825](https://linear.app/prime-radiant/issue/PRI-1825) ## Coordination Paired sen-core-v2 PR: https://github.com/prime-radiant-inc/sen-core-v2/pull/1 **Deploy order: merge this lace PR first, deploy lace, then merge the sen-core PR.** The sen-core caller currently passes `strategy: 'truncate'`; that call returns `InvalidParams` from the moment this PR lands until the sen-core PR is deployed. For Ada, this is a brief window during the rolling upgrade only. ## Test plan - [x] `npm run typecheck --workspace=packages/ent-protocol` - [x] `npm run typecheck --workspace=packages/agent` - [x] `npm run build --workspace=packages/agent` - [x] `npx vitest run src/rpc src/compaction` (59 passed) - [x] `npx vitest run src/__tests__/agent-process.e2e.test.ts -t "compact"` (2 passed) - [ ] Verify after deploy: `ent/session/compact { strategy: 'trim-tool-results' }` succeeds on Ada