docs: Requirements for the project.

.claude/adr/0003-inline-truncation-with-full-flag.md

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+# Use inline truncation hints and `--full`, not a temp-file path
+
+Body and diff text that exceeds the truncation limit is shortened inline with a hint appended to the field value — `"... (truncated, N chars total - use --full to see complete body)"`.
+The `--full` flag on `issue view` and `pr view` suppresses truncation and returns the full raw value.
+No temp file is written.
+
+## Considered Options
+
+**Save to a temp file, emit path in `full_content` field** (rejected) — The spec draft described this approach and attributed it to gh-axi, but that description was incorrect.
+Temp-file paths create a coupling to local filesystem state that does not survive across sessions or machines, and agents cannot rely on file paths persisting between calls.
+
+**Inline hint + `--full` flag** (chosen) — This is what gh-axi actually implements (`src/body.ts` → `truncateBody()`), and what the AXI principle 3 specifies: *"appending a size hint like '(truncated, 2847 chars total — use --full to see complete body)'"*.
+Simpler, portable, consistent with the stated reference.
+
+## Consequences
+
+`issue view` and `pr view` both accept `--full` to return untruncated body.
+`pr diff` truncates at 4000 chars (matching gh-axi's `DIFF_TRUNCATE_LIMIT`); when truncated, a next-step suggestion to rerun with `--full` is prepended.
+The `full_content` field name and temp-file design from the spec draft are dropped entirely.