chore: trim comments in src/fetch

[BraCR10]

Summary

Trims doc comments and inline comments across the fetch module (client.rs, filters_summary.rs), dropping internal spec/requirement/PR references entirely. Comment-only change, no logic touched.

Removed:

• Citations to internal spec/FR/PR/task-ID references throughout
• Test doc comments that only restated the test function's own name

Kept (shortened where possible):

• The empirical rationale behind the progress-indicator threshold
• The ordered-relay-list merge rationale (a real ordering bug fixed earlier)
• The relay URL canonicalization rationale (a real false-negative bug fixed earlier)
• The EventSource two-method split rationale
• The nostr-relay-pool panic-isolation rationale for spawning fetch in its own task
• Per-field semantics on RelayFetchOutcome and the has_no_usable_events gate

Test plan

• cargo build --all-targets
• cargo test (378 tests, unchanged count)
• cargo clippy --all-targets --all-features -- -D warnings
• cargo fmt --check
• Diff limited to comment-only lines

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: eb9ea870-b46a-47d6-b40e-f74df7f48ac2

📥 Commits

Reviewing files that changed from the base of the PR and between b7ddfa1 and c315005.

📒 Files selected for processing (2)

• src/fetch/client.rs
• src/fetch/filters_summary.rs

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