[TASK][PROGRAMME.T07] Integrate the complete desktop platform through P1-P5

Parent: #1

Task ID: `PROGRAMME.T07`

## Proposed implementation
Deliver persistent runtime, connector UI, agents/PC/files, supported writes/automation and inspectable learning/custom extensions as successive integrated releases. Retain every feature family and expose supported capability coverage honestly.

## Done when
P1-P5 integration demonstrations show the user can speak an intent, keep the resulting application, inspect sources, change providers and perform only bounded verified actions.

## Guardrail
Missing production access is a named dependency, not an excuse to claim unsupported Buy or Send actions.

## Prerequisites
`PROGRAMME.T04`, `PROGRAMME.T05`, `PROGRAMME.T06`

Review: pending · Implementation: not started.

Start with the parent issue #1 and prerequisites PROGRAMME.T04, PROGRAMME.T05, and PROGRAMME.T06; no files or tests are named in this task. Review the P1-P5 integration demonstrations and define completion around speaking an intent, retaining the application, inspecting sources, changing providers, and performing only bounded verified actions.

Written by the indexing model from the issue text.