docs: add task plan for Javadoc knowledge integration (#363)

[kiyotis]

Closes #363

Approach

This PR adds the task list and investigation notes for integrating Javadoc knowledge into the RBKC pipeline. The tasks are structured as: jar tool investigation → pipeline integration point investigation → design → implementation (additive only, no changes to existing RST/MD/xlsx pipeline). Implementation begins after user approval of the task plan on this PR.

Tasks

See tasks.md.

Expert Review

AI-driven expert reviews conducted before PR creation (see .claude/rules/expert-review.md):

(Expert review will be conducted before implementation is complete.)

Success Criteria Check

Criterion	Status	Evidence
Investigate: Identify the input/output format of the provided jar tool (source file → Markdown)	⏳ Not Yet Started	Implementation not started
Investigate: Determine appropriate integration point in the RBKC pipeline across all 5 versions	⏳ Not Yet Started	Implementation not started
Javadoc Markdown is generated for all public Nablarch classes in all 5 versions using the jar tool	⏳ Not Yet Started	Implementation not started
Generated Javadoc content is included in knowledge files and passes rbkc.sh verify for all 5 versions	⏳ Not Yet Started	Implementation not started
nabledge can correctly answer questions about Javadoc-deferred API details	⏳ Not Yet Started	Implementation not started
Benchmark scores for all 5 versions do not decrease vs. baseline after adding Javadoc knowledge	⏳ Not Yet Started	Implementation not started

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