refactor(data): expunge old BCS code references

- Replace BCS14xx with BCS11xx in section 11 (Concurrency) files
- Replace BCS13xx with BCS12xx in section 12 rulet file
- Regenerate canonical BASH-CODING-STANDARD files
- Delete obsolete OLD-TO-NEW-MAPPING.md

The old 14-section structure codes are no longer needed.

Author: Biksu Okusi

OLD-TO-NEW-MAPPING.md

@@ -27,4 +27,4 @@ wait "${PIDS[@]}"
 - `command &` without `pid=$!` â†' cannot manage job later
 - Using `$$` for background PID â†' wrong; `$$` is parent, `$!` is child
 
-**Ref:** BCS1406
+**Ref:** BCS1101

data/11-concurrency/01-background-jobs.abstract.md

@@ -1,6 +1,6 @@
 ### Background Job Management
 
-**Rule: BCS1406**
+**Rule: BCS1101**
 
 Managing background processes, job control, and process lifecycle in Bash scripts.
 
@@ -115,6 +115,6 @@ echo "Started $!"
 
 ---
 
-**See Also:** BCS1407 (Parallel Execution), BCS1408 (Wait Patterns), BCS1409 (Timeout Handling)
+**See Also:** BCS1102 (Parallel Execution), BCS1103 (Wait Patterns), BCS1104 (Timeout Handling)
 
 **Full implementation:** See `examples/exemplar-code/oknav/oknav` lines 475-510

data/11-concurrency/01-background-jobs.complete.md

@@ -1,6 +1,6 @@
 ### Background Job Management
 
-**Rule: BCS1406**
+**Rule: BCS1101**
 
 Managing background processes, job control, and process lifecycle.
 
@@ -103,4 +103,4 @@ echo "Started $!"
 
 ---
 
-**See Also:** BCS1407 (Parallel Execution), BCS1408 (Wait Patterns), BCS1409 (Timeout Handling)
+**See Also:** BCS1102 (Parallel Execution), BCS1103 (Wait Patterns), BCS1104 (Timeout Handling)

data/11-concurrency/01-background-jobs.summary.md

@@ -1,6 +1,6 @@
 ### Parallel Execution Patterns
 
-**Rule: BCS1407** (New)
+**Rule: BCS1102** (New)
 
 Executing multiple commands concurrently while maintaining control and collecting results.
 
@@ -110,6 +110,6 @@ count=$(wc -l < "$temp_dir"/count)
 
 ---
 
-**See Also:** BCS1406 (Background Jobs), BCS1408 (Wait Patterns)
+**See Also:** BCS1101 (Background Jobs), BCS1103 (Wait Patterns)
 
 **Full implementation:** See `examples/exemplar-code/oknav/oknav` lines 465-530

data/11-concurrency/02-parallel-execution.complete.md

@@ -1,6 +1,6 @@
 ### Parallel Execution Patterns
 
-**Rule: BCS1407**
+**Rule: BCS1102**
 
 Concurrent command execution with control and result collection.
 
@@ -106,4 +106,4 @@ count=$(wc -l < "$temp_dir"/count)
 
 ---
 
-**See Also:** BCS1406 (Background Jobs), BCS1408 (Wait Patterns)
+**See Also:** BCS1101 (Background Jobs), BCS1103 (Wait Patterns)

data/11-concurrency/02-parallel-execution.summary.md

@@ -41,6 +41,6 @@ done
 
 ---
 
-**See Also:** BCS1406, BCS1407
+**See Also:** BCS1101, BCS1102
 
 **Ref:** BCS1103

data/11-concurrency/03-wait-patterns.abstract.md

@@ -1,6 +1,6 @@
 ### Wait Patterns
 
-**Rule: BCS1408** (New)
+**Rule: BCS1103** (New)
 
 Proper synchronization when waiting for background processes.
 
@@ -105,4 +105,4 @@ wait $! || die 1 'Command failed'
 
 ---
 
-**See Also:** BCS1406 (Background Jobs), BCS1407 (Parallel Execution)
+**See Also:** BCS1101 (Background Jobs), BCS1102 (Parallel Execution)

data/11-concurrency/03-wait-patterns.complete.md

@@ -1,6 +1,6 @@
 ### Wait Patterns
 
-**Rule: BCS1408**
+**Rule: BCS1103**
 
 Proper synchronization when waiting for background processes.
 
@@ -101,4 +101,4 @@ wait $! || die 1 'Command failed'
 
 ---
 
-**See Also:** BCS1406 (Background Jobs), BCS1407 (Parallel Execution)
+**See Also:** BCS1101 (Background Jobs), BCS1102 (Parallel Execution)

data/11-concurrency/03-wait-patterns.summary.md

@@ -1,6 +1,6 @@
 ### Timeout Handling
 
-**Rule: BCS1409** (New)
+**Rule: BCS1104** (New)
 
 Managing command timeouts and handling timeout conditions gracefully.
 
@@ -104,6 +104,6 @@ timeout 300 ssh -o ConnectTimeout=10 "$server" 'long_command'
 
 ---
 
-**See Also:** BCS1410 (Exponential Backoff)
+**See Also:** BCS1105 (Exponential Backoff)
 
 **Full implementation:** See `examples/exemplar-code/oknav/oknav` line 676