feat(connector): Discord, Elasticsearch, Datadog, Redis, and MongoDB connectors

[michaelmcnees]

Summary

Adds 10 new connector actions across 5 services, closing issues #95, #98, #100, #104, #110:

• discord/send — POST text message to a channel (Bot token auth)
• discord/embed — POST embed message with title, description, color, fields, footer
• elasticsearch/search — POST /{index}/_search; supports API key or Basic auth
• elasticsearch/index — POST/PUT /{index}/_doc[/{id}]; auto-ID or explicit ID
• datadog/submit_event — POST /api/v1/events; optional alert_type, priority, tags, host
• datadog/query_metrics — GET /api/v1/query with required from/to Unix timestamps
• redis/get — GET key; returns {value, exists} (exists=false on cache miss, no error)
• redis/set — SET key with optional TTL
• redis/publish — PUBLISH to a pub/sub channel; returns receiver count
• mongodb/find — Find with optional filter, limit, skip, projection
• mongodb/aggregate — Run an aggregation pipeline

Also extracts a shared extractBearerToken helper in tools.go, removing duplicate implementations that existed in airtable.go, asana.go, and notion.go.

All connectors follow the established pattern: _credential map extraction, baseURL override for httptest injection, io.LimitReader, url.PathEscape on path segments, and dual map[string]string/map[string]any credential support.

Test plan

• 50 new unit tests pass (go test ./internal/connector/... -run "TestDiscord|TestElasticsearch|TestDatadog|TestRedis|TestMongo")
• All 17 registry tests pass
• go build ./cmd/mantle succeeds
• HTTP connectors (Discord, Elasticsearch, Datadog) tested against httptest servers
• Redis/MongoDB tests cover validation paths; live-server tests require Docker (skipped in unit test scope)

Closes #95, #98, #100, #104, #110

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6f2fb343-1e50-4fde-9f5e-e627a810cda4

📥 Commits

Reviewing files that changed from the base of the PR and between d06e723 and d05fba6.

⛔ Files ignored due to path filters (2)

• go.work.sum is excluded by !**/*.sum
• packages/engine/go.sum is excluded by !**/*.sum

📒 Files selected for processing (16)

• packages/engine/go.mod
• packages/engine/internal/connector/airtable.go
• packages/engine/internal/connector/asana.go
• packages/engine/internal/connector/connector.go
• packages/engine/internal/connector/datadog.go
• packages/engine/internal/connector/datadog_test.go
• packages/engine/internal/connector/discord.go
• packages/engine/internal/connector/discord_test.go
• packages/engine/internal/connector/elasticsearch.go
• packages/engine/internal/connector/elasticsearch_test.go
• packages/engine/internal/connector/mongodb.go
• packages/engine/internal/connector/mongodb_test.go
• packages/engine/internal/connector/notion.go
• packages/engine/internal/connector/redis.go
• packages/engine/internal/connector/redis_test.go
• packages/engine/internal/connector/tools.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/connector-batch-2

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