Various format/layout macros not converted across multiple files

## Problem

Multiple formatting and layout macros used for special typography are not being converted, appearing as raw LaTeX or causing layout issues.

## Issues by Macro Type

### 1. `\crange{}` - Range notation not converted (time.md)

**Line 7887:**
```markdown
\crange{69}{99}
\crange{00}{68}
```

**Expected:**
```markdown
[69, 99]
[00, 68]
```

**Count:** 2 instances  
**Severity:** Major

---

### 2. `\fmtnontermdef{}` - Grammar term definitions not converted (time.md)

**Lines 7407, 7412, 7419, 7424, 7429, 7434:**

Grammar productions showing raw `\fmtnontermdef{name}` instead of `*name:*`

**Example:**
```markdown
\fmtnontermdef{chrono-format-spec}
```

**Expected:**
```markdown
*chrono-format-spec:*
```

**Count:** 6 instances  
**Severity:** Major

---

### 3. `\texttt{}` - Monospace formatting not converted

**lex.md line 181:**
```markdown
| `U+005c` | reverse solidus | \texttt{\} |
```

**Expected:**
```markdown
| `U+005c` | reverse solidus | `\` |
```

**time.md line 7420:**
```markdown
\texttt{\}
```

**Expected:**
```markdown
}
```

**Count:** 2 instances (lex.md: 1, time.md: 1)  
**Severity:** Major

---

### 4. `\terminal{}` - Terminal symbol not converted (lex.md)

**Line 360:**
```markdown
\terminal{R}
```

**Expected:**
```markdown
'R' or R (as a terminal symbol)
```

**Count:** 1 instance  
**Severity:** Major

---

### 5. `\newline` - Line breaks not converted in tables (lex.md)

**Lines 1191-1195 (5 table rows):**

```markdown
| ... | array of $n$\newline `const char` | ... | `"ordinary string"`\newline `R"(ordinary raw string)"` |
```

**Expected:**
```markdown
| ... | array of $n$<br>`const char` | ... | `"ordinary string"`<br>`R"(ordinary raw string)"` |
```

**Count:** 5 instances  
**Severity:** Minor (table formatting)

---

### 6. `\linebreak{}` - Line break with extra braces (meta.md)

**Line 968:**
```markdown
add_poin\linebreak{}ter_t
```

**Expected:**
```markdown
add_pointer_t
```
(Or line break if appropriate)

**Count:** 1 instance  
**Severity:** Major

---

### 7. LaTeX escape sequences in grammar (time.md)

**Line 7420:**
```markdown
\{, \texttt{\}, \%
```

**Expected:**
```markdown
{, }, %
```

**Count:** 3 escapes in one line  
**Severity:** Major

---

### 8. `\libheaderref{}` - Header references in footnotes (future.md)

**Lines 471-473, 818:**

Header names completely missing from footnotes.

**Current:**
```markdown
is declared in .
```

**Expected:**
```markdown
is declared in `<cstring>`.
```

**Count:** 3 instances  
**Severity:** Major

---

### 9. Implementation-defined not italicized (diagnostics.md)

**Lines 1251, 1370, 1374, 1375, 1524:**

```cpp
using native_handle_type = implementation-defined
```

**Expected:**
```cpp
using native_handle_type = *implementation-defined*
```

**Count:** 6 instances (5 wrong, 1 correct in prose)  
**Severity:** Major

## Impact

- **Severity**: MAJOR overall (some individual instances are minor)
- Multiple files affected with various formatting/layout issues
- Makes code and tables harder to read
- Inconsistent rendering across the document
- Some cause actual content loss (header refs, line breaks)

## Root Cause

Multiple filters need to handle these macros:
- `cpp-macros.lua` - Most text macros
- `cpp-tables.lua` - Table-specific formatting
- `cpp-grammar.lua` - Grammar-specific macros
- `cpp-code-blocks.lua` - Code block escapes

## Recommendation

Add macro handling for each of these in the appropriate filter(s). Most are straightforward substitutions once identified.

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Uh oh!

Various format/layout macros not converted across multiple files #27

Problem

Issues by Macro Type

1. `\crange{}` - Range notation not converted (time.md)

2. `\fmtnontermdef{}` - Grammar term definitions not converted (time.md)

3. `\texttt{}` - Monospace formatting not converted

4. `\terminal{}` - Terminal symbol not converted (lex.md)

5. `\newline` - Line breaks not converted in tables (lex.md)

6. `\linebreak{}` - Line break with extra braces (meta.md)

7. LaTeX escape sequences in grammar (time.md)

8. `\libheaderref{}` - Header references in footnotes (future.md)

9. Implementation-defined not italicized (diagnostics.md)

Impact

Root Cause

Recommendation

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Various format/layout macros not converted across multiple files #27

Description

Problem

Issues by Macro Type

1. \crange{} - Range notation not converted (time.md)

2. \fmtnontermdef{} - Grammar term definitions not converted (time.md)

3. \texttt{} - Monospace formatting not converted

4. \terminal{} - Terminal symbol not converted (lex.md)

5. \newline - Line breaks not converted in tables (lex.md)

6. \linebreak{} - Line break with extra braces (meta.md)

7. LaTeX escape sequences in grammar (time.md)

8. \libheaderref{} - Header references in footnotes (future.md)

9. Implementation-defined not italicized (diagnostics.md)

Impact

Root Cause

Recommendation

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions

1. `\crange{}` - Range notation not converted (time.md)

2. `\fmtnontermdef{}` - Grammar term definitions not converted (time.md)

3. `\texttt{}` - Monospace formatting not converted

4. `\terminal{}` - Terminal symbol not converted (lex.md)

5. `\newline` - Line breaks not converted in tables (lex.md)

6. `\linebreak{}` - Line break with extra braces (meta.md)

8. `\libheaderref{}` - Header references in footnotes (future.md)