docs(17-03): complete bot command handlers plan

- SUMMARY.md with implementation details and self-check passed
- STATE.md updated with progress, metrics, decisions
- Requirements TELE-01, TELE-02, TELE-03, TELE-04, TELE-06 marked complete

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 16-01-PLAN.md
-last_updated: "2026-04-06T13:48:35.313Z"
+stopped_at: Completed 17-03-PLAN.md
+last_updated: "2026-04-06T14:36:30.928Z"
 last_activity: 2026-04-06
 progress:
   total_phases: 18
-  completed_phases: 14
-  total_plans: 85
-  completed_plans: 83
+  completed_phases: 15
+  total_plans: 86
+  completed_plans: 84
   percent: 20
 ---
 
@@ -100,6 +100,7 @@ Progress: [██░░░░░░░░] 20%
 | Phase 15 P01 | 3min | 2 tasks | 13 files |
 | Phase 15 P03 | 4min | 2 tasks | 11 files |
 | Phase 16 P01 | 4min | 2 tasks | 6 files |
+| Phase 17 P03 | 5min | 3 tasks | 6 files |
 
 ## Accumulated Context
 
@@ -152,6 +153,8 @@ Recent decisions affecting current work:
 - [Phase 16]: VT uses x-apikey header per official API v3 spec
 - [Phase 16]: IX uses three-step flow: POST search, GET results, GET file content
 - [Phase 16]: URLhaus tag lookup with payload endpoint fallback
+- [Phase 17]: Telego v1.8.0 handler context pattern: *th.Context implements context.Context for scan/recon timeout propagation
+- [Phase 17]: /key enforced private-chat-only via chat.Type check; all other bot commands use masked keys
 
 ### Pending Todos
 
@@ -166,6 +169,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-06T13:46:09.383Z
-Stopped at: Completed 16-01-PLAN.md
+Last session: 2026-04-06T14:36:30.924Z
+Stopped at: Completed 17-03-PLAN.md
 Resume file: None