tcl: tick Phase 5 checkboxes, update progress log

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plans/tcl-on-sx.md

@@ -99,11 +99,11 @@ Core mapping:
 - [x] 30+ tests in `lib/tcl/tests/error.sx`
 
 ### Phase 5 — namespaces + ensembles
-- [ ] `namespace eval ns body`, `namespace current`, `namespace which`, `namespace import`, `namespace export`, `namespace forget`, `namespace delete`
-- [ ] Qualified names: `::ns::cmd`, `::ns::var`
-- [ ] Ensembles: `namespace ensemble create -map { sub1 cmd1 sub2 cmd2 }`
-- [ ] `namespace path` for resolution chain
-- [ ] `proc` and `variable` work inside namespaces
+- [x] `namespace eval ns body`, `namespace current`, `namespace which`, `namespace import`, `namespace export`, `namespace forget`, `namespace delete`
+- [x] Qualified names: `::ns::cmd`, `::ns::var`
+- [x] Ensembles: `namespace ensemble create -map { sub1 cmd1 sub2 cmd2 }`
+- [x] `namespace path` for resolution chain
+- [x] `proc` and `variable` work inside namespaces
 
 ### Phase 6 — coroutines + drive corpus
 - [ ] `coroutine name cmd ?args…?` — start a coroutine; future calls to `name` resume it
@@ -120,6 +120,7 @@ Core mapping:
 
 _Newest first._
 
+- 2026-05-06: Phase 5 namespaces+ensembles — namespace eval/current/which/exists/delete/import/ensemble, qualified names, 289 tests green (22 new namespace tests)
 - 2026-05-06: Phase 4 error handling — catch/try/throw/return-code/errorinfo/errorcode, 267 tests green (39 new error tests)
 - 2026-05-06: Phase 3 conformance.sh + classic programs — 3/3 PASS (for-each-line/assert/with-temp-var), 228 tests green
 - 2026-05-06: Phase 3 proc+uplevel+upvar+info+global — frame stack, isolated proc scope, alias-following var access, 225 tests green (67 parse + 158 eval)