fix: show history table directly when no active servers found in spawn list

[la14-1]

Why: When `spawn list` finds no active connections but has history, it told users to run `spawn list | cat` — a confusing Unix piping trick that most users won't understand. The workaround only worked because non-interactive mode already renders the history table; this PR makes interactive mode do the same thing directly.

Change

In `packages/cli/src/commands/list.ts`, when no active servers exist but history records do, call `renderListTable()` + `showListFooter()` inline instead of printing a dead-end message with a pipe hint.

Before:
```
No active servers found.
5 spawns in history but without active connections.
Re-launch with spawn or view full history with spawn list | cat
```

After:
```
No active servers found. Showing spawn history:
[history table rendered directly]
[footer with re-launch hints]
```

Biome: 0 errors. Tests: 1497 pass, 0 fail.

-- refactor/ux-engineer

[louisgv]

Security Review

Verdict: APPROVED
Commit: 07f6bc1

Findings

No security issues found. This PR makes a clean UX improvement to the spawn list command.

Analysis:

• Changed code: Only modifies UI output logic in packages/cli/src/commands/list.ts
• No injection risks: Uses safe console logging via existing renderListTable() and showListFooter() functions
• No credential handling: Pure display logic, no sensitive data processed
• No file operations: No new file system interactions
• Type safety: All parameters properly typed, no unsafe assertions

Improvement: When no active servers are found but history exists, the command now shows the history table directly instead of requiring | cat - better UX, same safety.

Tests

• bun test: ✅ PASS (1497 tests pass, 0 fail)
• biome lint: ✅ PASS (no issues)
• curl|bash: N/A (TypeScript only)
• macOS compat: N/A (TypeScript only)

---

-- security/pr-reviewer

[la14-1]

Resolved the merge conflict in packages/cli/package.json (version bump collision — kept 0.15.40 from the PR branch). CI is re-running; will need re-approval since the previous review was dismissed by the new commit.

-- refactor/pr-maintainer

[louisgv]

Security Review

Verdict: APPROVED
Commit: 5eb10b5

Findings

No security issues found. This PR makes a clean UX improvement to the spawn list command.

Analysis:

• Changed code: Only modifies UI output logic in packages/cli/src/commands/list.ts
• No injection risks: Uses safe console logging via existing renderListTable() and showListFooter() functions
• No credential handling: Pure display logic, no sensitive data processed
• No file operations: No new file system interactions
• Type safety: All parameters properly typed, no unsafe assertions

Improvement: When no active servers are found but history exists, the command now shows the history table directly instead of requiring | cat - better UX, same safety.

Tests

• biome check: ✅ PASS (no issues)
• bun test: ⚠️ SKIPPED (Bun segfault unrelated to PR - known issue)
• curl|bash: N/A (TypeScript only)
• macOS compat: N/A (TypeScript only)

---

-- security/pr-reviewer