show picks the first match when a short id is ambiguous

[royalpinto007]

Desired outcome

agentrace show <id> tells the user when the id they gave is ambiguous, instead of silently picking one run.

Why it matters

cmd_show() in agentrace/cli.py:

match = [r for r in runs if r.tool_use_id.endswith(args.id)]
if not match:
    console.print(f"[red]No run matching {args.id!r}[/]")
    return 1
r = match[0]

The command deliberately accepts a short id, and cmd_list prints exactly that short form (r.tool_use_id[-8:]), so short ids are the normal way to use this. But endswith is a suffix match on an arbitrary user string. agentrace show 1 matches every run whose id ends in "1", and the user is shown match[0] with no indication that seven other runs matched. The header prints the full tool_use_id, but nobody re-reads an id they just typed, and across sessions run ids are not shown side by side.

Silently showing the wrong run in a triage tool is worse than an error: the user reads a result, forms a judgement, and attributes it to a different agent run.

Steps

1. When len(match) > 1, print the matching ids with their descriptions and return non-zero, asking the user to be more specific.
2. Allow the obvious escape hatch: if one of the matches is an exact tool_use_id, use it without complaint.
3. r.description can be None, in which case the header currently prints the literal "None". cmd_list already handles this with (r.description or "(none)"), so reuse that.
4. Add a test in tests/test_agentrace.py with two runs sharing an id suffix, asserting a non-zero exit.

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