feat(claude): nudge fresh sessions to load the pql + clide skills (T-490)

A fresh Claude session now gets a one-line preamble (clideSkillsNote) telling it
to reach for the bundled pql + clide skills from its first turn rather than
rediscovering the workflows. Layered onto clideContextNote in the single
--append-system-prompt.

Gated on a NEW session (!spec.resume && !spec.isFork): new tabs and the
post-/clear respawn spawn with resume:false and get it; the account-change
respawn (T-480) and real resumes carry prior context (resume:true), and forks
inherit their source — none are re-nagged. Both skills already ship (pql
user-scope, clide repo-scope), so no precursor was needed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/builtin/claude/src/agent_bootstrap.dart

@@ -58,6 +58,16 @@ String clideContextNote(String workspaceRoot) =>
     'is how you observe and drive the same workspace the user sees — prefer it for IDE actions so '
     'your work and the user\'s stay in one shared workspace.';
 
+/// Nudge a FRESH session to reach for the bundled skills from its first turn
+/// rather than rediscovering the workflows (T-490). Layered on top of
+/// [clideContextNote]; only injected for new sessions (not --resume / forks),
+/// so a session that already carries context is never re-nagged.
+String clideSkillsNote() =>
+    'Two skills are available in this workspace — load and use them from your first turn instead '
+    'of rediscovering their workflows: `pql` (planning, decisions, tickets, and vault queries) and '
+    '`clide` (driving this IDE). Reach for the matching skill whenever a task touches planning or '
+    'tickets, or the clide surface.';
+
 /// Build the environment DELTA to overlay on a hosted session's inherited
 /// environment (T-215). `Process.start` keeps the parent environment by
 /// default, so this returns only the keys to add/override:

lib/builtin/claude/src/session_orchestrator.dart

@@ -244,6 +244,11 @@ class ClaudeSessionOrchestrator extends ChangeNotifier {
     // note and the team preamble merge into ONE --append-system-prompt (claude
     // honours a single one).
     final preambles = <String>[clideContextNote(spec.cwd)];
+    // Nudge a FRESH session to reach for the bundled skills (T-490). A new tab
+    // and the post-/clear respawn spawn with resume:false; the account-change
+    // respawn (T-480) and real resumes carry prior context (resume:true), and a
+    // fork inherits its source — none of those are re-nagged.
+    if (!spec.resume && !spec.isFork) preambles.add(clideSkillsNote());
     if (spec.team) {
       final name = spec.memberName ?? spec.role;
       broker.addMember(TeamMemberRef(id: spec.id, name: name, role: spec.role));