docs(15-01): complete forum/discussion sources plan

- SUMMARY.md with 6 sources, 2 tasks, 13 files
- STATE.md advanced, ROADMAP.md updated, requirements marked

.planning/phases/15-osint_forums_collaboration_log_aggregators/15-01-SUMMARY.md

@@ -0,0 +1,118 @@
+---
+phase: 15-osint_forums_collaboration_log_aggregators
+plan: 01
+subsystem: recon
+tags: [stackoverflow, reddit, hackernews, discord, slack, devto, osint, forums]
+
+requires:
+  - phase: 10-osint-code-hosting
+    provides: "ReconSource interface, Client, BuildQueries, ciLogKeyPattern, RegisterAll"
+provides:
+  - "StackOverflowSource searching SE API v2.3 for leaked keys"
+  - "RedditSource searching Reddit JSON API for leaked keys"
+  - "HackerNewsSource searching Algolia HN API for leaked keys"
+  - "DiscordSource using dorking for indexed Discord content"
+  - "SlackSource using dorking for indexed Slack archives"
+  - "DevToSource searching dev.to API articles for leaked keys"
+affects: [recon-engine, register-all, phase-15-plans]
+
+tech-stack:
+  added: []
+  patterns: [dorking-based-search-for-closed-platforms]
+
+key-files:
+  created:
+    - pkg/recon/sources/stackoverflow.go
+    - pkg/recon/sources/stackoverflow_test.go
+    - pkg/recon/sources/reddit.go
+    - pkg/recon/sources/reddit_test.go
+    - pkg/recon/sources/hackernews.go
+    - pkg/recon/sources/hackernews_test.go
+    - pkg/recon/sources/discord.go
+    - pkg/recon/sources/discord_test.go
+    - pkg/recon/sources/slack.go
+    - pkg/recon/sources/slack_test.go
+    - pkg/recon/sources/devto.go
+    - pkg/recon/sources/devto_test.go
+  modified:
+    - pkg/recon/sources/register.go
+
+key-decisions:
+  - "Discord and Slack use dorking approach (configurable search endpoint) since neither has public message search API"
+  - "DevTo fetches article list then detail endpoint for body_markdown, limited to first 5 articles per keyword"
+  - "Reddit sets custom User-Agent to avoid blocking by Reddit's default UA filter"
+
+patterns-established:
+  - "Dorking pattern: for platforms without public search APIs, use configurable search endpoint with site: prefix queries"
+
+requirements-completed: [RECON-FORUM-01, RECON-FORUM-02, RECON-FORUM-03, RECON-FORUM-04, RECON-FORUM-05, RECON-FORUM-06]
+
+duration: 3min
+completed: 2026-04-06
+---
+
+# Phase 15 Plan 01: Forum/Discussion Sources Summary
+
+**Six forum ReconSources (StackOverflow, Reddit, HackerNews, Discord, Slack, DevTo) scanning developer discussions for leaked API keys**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-04-06T13:27:19Z
+- **Completed:** 2026-04-06T13:30:02Z
+- **Tasks:** 2
+- **Files modified:** 13
+
+## Accomplishments
+- Three API-based sources (StackOverflow SE API, Reddit JSON, HackerNews Algolia) for direct forum search
+- Two dorking-based sources (Discord, Slack) for platforms without public search APIs
+- DevTo two-phase search (article list + detail fetch) with rate limit protection
+- RegisterAll extended with all 6 new forum sources
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: StackOverflow, Reddit, HackerNews sources** - `282c145` (feat)
+2. **Task 2: Discord, Slack, DevTo sources + RegisterAll wiring** - `fcc1a76` (feat)
+
+## Files Created/Modified
+- `pkg/recon/sources/stackoverflow.go` - SE API v2.3 search/excerpts source
+- `pkg/recon/sources/stackoverflow_test.go` - httptest mock tests
+- `pkg/recon/sources/reddit.go` - Reddit JSON API search source with custom UA
+- `pkg/recon/sources/reddit_test.go` - httptest mock tests
+- `pkg/recon/sources/hackernews.go` - Algolia HN Search API source
+- `pkg/recon/sources/hackernews_test.go` - httptest mock tests
+- `pkg/recon/sources/discord.go` - Dorking-based Discord content search
+- `pkg/recon/sources/discord_test.go` - httptest mock tests
+- `pkg/recon/sources/slack.go` - Dorking-based Slack archive search
+- `pkg/recon/sources/slack_test.go` - httptest mock tests
+- `pkg/recon/sources/devto.go` - dev.to API article list + detail search
+- `pkg/recon/sources/devto_test.go` - httptest mock tests with list+detail endpoints
+- `pkg/recon/sources/register.go` - Extended RegisterAll with 6 forum sources
+
+## Decisions Made
+- Discord and Slack use configurable search endpoint dorking since neither platform has public message search APIs
+- DevTo limits to first 5 articles per keyword to stay within rate limits
+- Reddit requires custom User-Agent header to avoid 429 blocking
+- Discord/Slack findings marked as "low" confidence (indirect via search indexers); API-based sources marked "medium"
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - all six sources are credentialless and always enabled.
+
+## Next Phase Readiness
+- All forum/discussion sources registered in RegisterAll
+- Ready for Phase 15 Plan 02+ (collaboration tools, log aggregators)
+
+---
+*Phase: 15-osint_forums_collaboration_log_aggregators*
+*Completed: 2026-04-06*