fix(contacts): add view action, show phones in list, preserve fields on update

[holden093]

Note: Re-opening of #4748, auto-closed 2026-07-23 during the odysseus-dev org transfer (the dev history rewrite force-closed all open PRs). Same change, cleanly rebased onto the current dev. Original review thread: #4748.

Summary

Fixes three gaps in the manage_contacts agent tool that made phone-number workflows unreliable: list now includes phone numbers, a new view action returns full contact details by UID, and update preserves existing emails/phones when the caller doesn't pass them (preventing data loss on partial edits like renaming).

Target branch

• This PR targets dev, not main.

Linked Issue

Fixes #4747

Type of Change

• Bug fix (non-breaking — fixes a confirmed issue)

Checklist

• I searched open issues and open PRs — this is not a duplicate.
• This PR targets dev
• My changes are limited to the scope described above — no unrelated refactors or whitespace changes mixed in.
• I actually ran the app (docker compose up or uvicorn app:app) and verified the change works end-to-end. Type-checks and unit tests are not enough.

How to Test

1. Add a contact with name, email, and phone number via the UI or CardDAV.
2. Ask the agent to "list my contacts" — verify phone numbers appear in the output.
3. Ask the agent to "view contact [name]" — verify full details (phones, address, UID) are shown.
4. Ask the agent to "rename [contact] to [new name]" — verify the phone and email are preserved after the update.

Visual / UI changes

None — backend-only change.

[holden093]

Heads-up: the failing Python tests (pytest) check is a pre-existing dev bug, not this PR

The pytest job fails at test collection, before any of this PR's changes are exercised:

NameError: name 'Any' is not defined

Root cause is on dev itself: src/agent_loop.py annotates with dict[str, Any] (lines 1503 and 1877) but only imports AsyncGenerator, List, Dict, Optional, Set — no Any, and no from __future__ import annotations. So importing the module raises NameError, which breaks collection for every test that transitively imports agent_loop (hence the repo-wide failure).

This PR doesn't touch agent_loop.py; every other check (syntax, CodeQL, lint, security scans) passes here, and this PR's own tests pass locally.

One-line fix (add Any to the typing import) is included in #5751. Once dev carries that fix, this PR's pytest will go green with no changes needed here.