docs: update STATE.scm - Phase 6 M2 and Phase 0 Sealing complete

Update project state to reflect completion of:
- Phase 6 Milestone 2: I/O Redirections (v0.7.1)
- Phase 0 Sealing: Foundation hardening (v0.7.2)

Changes:
- Overall completion: 65% → 72%
- Rust CLI status: working → production-ready (90% complete)
- Updated working features list (redirections, SIGINT, error recovery)
- Marked M2 and Phase 0 milestones as complete
- Removed 'Redirections not implemented' from blockers
- Updated next actions to focus on Phase 6 M3 (Pipelines)
- Added session history for M2 and Phase 0 work

All 90 tests passing, documentation complete, CI pipeline active.
Ready for Phase 6 M3: Pipeline implementation.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Test

STATE.scm

@@ -26,8 +26,8 @@
      (version . "0.7.0"))
 
     (current-position
-     (phase . "Phase 4 In Progress / Phase 6 M1 Complete")
-     (overall-completion . 65)
+     (phase . "Phase 6 M2 Complete / Phase 0 Sealing Complete")
+     (overall-completion . 72)
 
      (components
       (proofs
@@ -36,9 +36,9 @@
        (details . "256+ theorems across 6 proof systems: Coq, Lean 4, Agda, Isabelle/HOL, Mizar, Z3"))
 
       (rust-cli
-       (status . "working")
-       (completion . 85)
-       (details . "Interactive shell with undo/redo, external command execution, all tests passing (27/27)"))
+       (status . "production-ready")
+       (completion . 90)
+       (details . "Interactive shell with redirections, SIGINT handling, error recovery, comprehensive docs. All tests passing (90/90: 44 unit + 27 integration + 19 property)"))
 
       (elixir-impl
        (status . "failing-build")
@@ -57,18 +57,25 @@
 
       (shell-parser
        (status . "working")
-       (completion . 20)
-       (details . "Basic command parser implemented, external command support added")))
+       (completion . 75)
+       (details . "Full parser with redirections, external commands, built-ins")))
 
      (working-features
       "Rust CLI with mkdir/rmdir/touch/rm"
       "External command execution (ls, cat, echo, etc.)"
       "PATH lookup and executable discovery"
-      "Exit code tracking"
+      "I/O Redirections (>, >>, <, 2>, 2>>, &>, 2>&1)"
+      "Redirection undo support (file truncate/append reversible)"
+      "SIGINT handling (Ctrl+C interrupts commands, not shell)"
+      "Process group management for job control"
+      "Exit code tracking with signal detection"
       "Undo/redo with operation history"
-      "Transaction grouping"
+      "Transaction grouping with partial rollback reporting"
       "Proof references for each operation"
-      "Integration tests (27/27 passing)"
+      "Error recovery with visibility (no silent failures)"
+      "Comprehensive API documentation (rustdoc)"
+      "GitHub Actions CI pipeline"
+      "All tests passing (90/90: 44 unit + 27 integration + 19 property)"
       "Formal proofs verified in 6 systems"))
 
     (route-to-mvp
@@ -122,17 +129,41 @@
           "✓ Integration tests (14/14 passing)"
           "✓ Manual testing successful"))
         ((name . "Milestone 2: Redirections")
+         (status . "complete")
+         (version . "0.7.1")
+         (items
+          "✓ Output redirection (>)"
+          "✓ Input redirection (<)"
+          "✓ Append redirection (>>)"
+          "✓ Error redirection (2>, 2>>)"
+          "✓ Combined redirection (&>, 2>&1)"
+          "✓ Redirection undo support (file modifications reversible)"
+          "✓ Redirection parser with proper precedence"
+          "✓ File truncate/append tracking for undo"
+          "✓ All tests passing (90/90)"))
+        ((name . "Phase 0: Sealing")
+         (status . "complete")
+         (version . "0.7.2")
+         (items
+          "✓ SIGINT handling (Ctrl+C interrupts commands, not shell)"
+          "✓ Error recovery (no silent state persistence failures)"
+          "✓ Transaction rollback error reporting"
+          "✓ Test fixtures migration (modern test_sandbox)"
+          "✓ Getting Started guide and examples"
+          "✓ GitHub Actions CI pipeline"
+          "✓ Comprehensive API documentation (rustdoc)"))
+        ((name . "Milestone 3: Pipelines")
          (status . "planned")
          (items
-          "□ Output redirection (>)"
-          "□ Input redirection (<)"
-          "□ Append redirection (>>)"
-          "□ Error redirection (2>)")))
+          "□ Pipeline operator (|)"
+          "□ Multi-stage pipeline execution"
+          "□ Pipeline error handling"
+          "□ Pipeline undo support")))
        (items
         "✓ Basic command parser implemented"
         "✓ External command execution"
+        "✓ Redirections (>, <, >>, 2>, 2>>, &>, 2>&1)"
         "□ Pipeline support (|)"
-        "□ Redirections (>, <, >>)"
         "□ Variables ($VAR)"
         "□ Glob expansion (*.txt)"
         "□ Quote processing"
@@ -145,15 +176,14 @@
       "No formal correspondence proofs yet")
 
      (high
-      "Elixir NIF Zigler version conflict (low priority - use Rust CLI)"
-      "Redirections not implemented (Phase 6 M2)"
       "Pipelines not implemented (Phase 6 M3)")
 
      (medium
       "Variables not implemented (Phase 6 M4)"
       "Glob expansion not implemented"
       "Quote processing not implemented"
-      "Job control not implemented")
+      "Job control not implemented"
+      "Elixir NIF Zigler version conflict (low priority - use Rust CLI)")
 
      (low
       "ECOSYSTEM.scm needs updating"
@@ -162,20 +192,21 @@
 
     (critical-next-actions
      (immediate
-      "Start Phase 6 M2: Redirections design"
-      "Test external command execution with real workflows"
-      "Update integration tests for external commands")
+      "Start Phase 6 M3: Pipeline implementation (cmd1 | cmd2)"
+      "Design pipeline execution model with undo support"
+      "Test redirections with real-world workflows")
 
      (this-week
-      "Design Phase 6 M2: Redirections (>, <, >>)"
-      "Implement Echidna validation pipeline"
-      "Begin Lean 4 → Rust correspondence proofs")
+      "Implement Phase 6 M3: Pipelines (|)"
+      "Pipeline parser extensions"
+      "Multi-stage execution engine"
+      "Pipeline error handling and undo")
 
      (this-month
-      "Complete Phase 6 M2: Redirections"
-      "Start Phase 6 M3: Pipelines"
-      "Verify simple operations match Lean 4 specs"
-      "Implement property-based testing with Echidna"))
+      "Complete Phase 6 M3: Pipelines"
+      "Start Phase 6 M4: Variables"
+      "Begin Echidna validation pipeline"
+      "Begin Lean 4 → Rust correspondence proofs"))
 
     (session-history
      ((timestamp . "2025-01-28")
@@ -200,7 +231,28 @@
        "Created LEAN4_RUST_CORRESPONDENCE.md"
        "Created ECHIDNA_INTEGRATION.md"
        "Created ARCHITECTURE.md"
-       "Created POSIX_COMPLIANCE.md with 14-milestone roadmap")))))
+       "Created POSIX_COMPLIANCE.md with 14-milestone roadmap"))
+
+     ((timestamp . "2026-01-28")
+      (accomplishments
+       "Completed Phase 6 Milestone 2: I/O Redirections"
+       "Implemented all POSIX redirections (>, >>, <, 2>, 2>>, &>, 2>&1)"
+       "Added redirection parser with proper precedence"
+       "Implemented file modification tracking for undo"
+       "File truncate/append operations reversible"
+       "All tests passing (90/90: 44 unit + 27 integration + 19 property)"
+       "Created PHASE6_M2_COMPLETE.md"
+       "Updated STATE.scm to v0.7.1"
+       "Completed Phase 0 Sealing (foundation hardening)"
+       "Component 1: SIGINT handling (Ctrl+C for external commands)"
+       "Component 2: Error recovery (no silent failures)"
+       "Component 3: Test fixtures migration"
+       "Component 4: Getting Started guide + examples"
+       "Component 5: GitHub Actions CI pipeline"
+       "Component 6: Comprehensive API documentation (rustdoc)"
+       "All documentation builds without warnings"
+       "Pushed to GitHub: 6 commits (Phase 0) + foundation work"
+       "Updated STATE.scm to v0.7.2")))))
 
 (define (get-state)
   "Return the current project state"