Feature/config driven reputation

[charliechinedu19-netizen]

Description

Externalizes reputation scoring weights (System B: src/services/reputation/) into versioned, environment-driven configuration, allowing operators to tune the scoring model via .env without code changes.

Closes #1005

Changes

New Environment Variables

Variable	Default	Description
REPUTATION_BOND_MULTIPLIER	0.01	Bond amount → score multiplier
REPUTATION_MAX_BOND_SCORE	1000	Bond score cap
REPUTATION_ATTESTATION_MULTIPLIER	0.1	Attestation weight → score multiplier
REPUTATION_MAX_ATTESTATION_WEIGHT	100	Attestation score cap
REPUTATION_MAX_DURATION_MS	31536000000 (1 year)	Duration for full time weight
REPUTATION_TIME_DECAY_RATE	0.5	Exponential decay rate for time weight

Files Modified (12 files, +344/-49)

• src/config/index.ts — Added Zod schema, Config interface fields, and mapper for 6 new vars
• src/services/reputation/types.ts — Added ReputationModuleConfig interface
• src/services/reputation/bondScore.ts — Parameterized; accepts optional ReputationModuleConfig, defaults to original constants
• src/services/reputation/attestationScore.ts — Same pattern
• src/services/reputation/timeWeight.ts — Same pattern; maxDuration param made optional (defaults from config)
• src/services/reputation/score.ts — Threads config through calculateReputationScore, calculatePersistedReputationScore, recordScoreHistorySnapshot, and calculateReputationScoreWithCustomDuration
• src/jobs/scoreSnapshot.ts — Defaults scoringModelVersion from loadConfig().reputation.scoringModelVersion instead of hardcoded '1.0.0'
• src/services/reputation/README.md — Updated config docs, API signatures, and removed stale constants section
• src/services/reputation/bondScore.test.ts, attestationScore.test.ts, timeWeight.test.ts, score.test.ts — Added config-driven test cases (+15 tests)

Backward Compatibility

All existing callers continue to work without changes. When no ReputationModuleConfig is passed, each scoring function falls back to module-level defaults that produce identical scores to the previous hardcoded constants. The SnapshotJobOptions.scoringModelVersion override still takes precedence over the config default.

Testing

• All 123 tests pass (108 existing + 15 new)
• Config validation test suite (`src/config/repu

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[charliechinedu19-netizen]

@Baskarayelu Please review and merge