docs(prompt): Precise Anchoring for inline comments (use line+side; avoid position)

[mtpauly]

Update review request template to enforce precise anchoring for inline comments

This PR introduces a "Precise Anchoring" section to the code review prompt template, guiding reviewers to anchor comments by line + side rather than the patch-relative position field.

Key changes:

• Instruct reviewers to anchor using line + side; avoid position.
• Default to side="RIGHT" for added/modified lines; use side="LEFT" only for deleted lines.
• Validate anchors before posting; if uncertain, prefer a single brief general comment over inline.
• Allow suggestion blocks (```suggestion) only on side="RIGHT"; emphasize precise anchoring when proposing edits.
• For multi-line ranges, set start_line/start_side and line/side consistently on the same side.

Impact:

• Reduces off-by-one and hunk-position errors when anchoring comments.
• Improves reliability of suggestion blocks and auto-applied edits.
• No runtime or functional changes; documentation/prompt-only update.

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[github-actions]

Clear and helpful guidance on precise anchoring. I left one suggestion to fix an unmatched code-fence in the new section to avoid rendering issues.

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