feat: export analysis reports as PDF (save_pdf)

[luceinaltis]

Context

PR #144 attempted this but was based on a pre-refactor codebase and was closed. The existing ReportExporter already has save_markdown() and save_json(). The CLI already has save and save json REPL commands. Only save_pdf() is missing.

Goal

Add PDF export capability to ReportExporter using fpdf2.

Scope

• Add ReportExporter.save_pdf(intent, analysis, response_text) -> Path method
• Add save_last_report(fmt="pdf") branch in ConversationEngine
• Add save pdf / /save pdf REPL commands in CLI
• Register fpdf2>=2.7.0 as optional [pdf] dependency in pyproject.toml
• Tests for PDF generation (verify file created, non-zero size, contains expected text)

Estimate

~50-80 lines of new code. Small, self-contained task.

[luceinaltis]

This already appears to be fully implemented on main via commit 85759b2 (PR #154, merged 2026-04-09 — before this issue was filed). Every scope item is live:

• ReportExporter.save_pdf(intent, analysis, response_text) -> Path — qracer/conversation/report_exporter.py:159
• save_last_report(fmt="pdf") branch — qracer/conversation/engine.py:192
• save pdf / /save pdf REPL commands (with ImportError fallback when fpdf2 isn't installed) — qracer/cli.py
• fpdf2>=2.7.0 registered as the [pdf] optional dependency — pyproject.toml
• PDF tests covering file creation, non-zero size, and expected text content — tests/conversation/test_report_exporter.py::TestReportExporterPdf (4 cases, all passing on main)

uv run pytest tests/conversation/test_report_exporter.py → 11 passed (including the 4 PDF cases).

Suggest closing this as already-done unless there's an additional requirement not captured above.

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[luceinaltis]

All scope items from this issue are already implemented on main:

• ReportExporter.save_pdf() — qracer/conversation/report_exporter.py (lines 159–253), using fpdf2 with header, metadata, query, response, trade thesis, and data sources sections.
• save_last_report(fmt="pdf") — wired in ConversationEngine (engine.py, line 193).
• save pdf / /save pdf REPL commands — handled in cli.py (lines 506–516) with ImportError guard for missing fpdf2.
• fpdf2>=2.7.0 as optional [pdf] dependency — pyproject.toml line 23.
• Tests — 4 PDF tests in tests/conversation/test_report_exporter.py (lines 134–172) covering basic generation, trade thesis inclusion, data sources filtering, and general-ticker fallback. All pass.

This issue can be closed — no further work is needed.

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